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RBSE Class 10 Maths Important Questions Chapter 10 Circles

April 22, 2022 by Safia Leave a Comment

Rajasthan Board RBSE Class 10 Maths Important Questions Chapter 10 Circles Important Questions and Answers.

RBSE Class 10 Maths Chapter 10 Important Questions Circles

Objective Type Questions—

Question 1.
The length of a tangent from an external point A to a circle of radius 6 cm is 10 cm. The distance of the centre of the circle from point A will be—
(A) 7 cm
(B) 8 cm
(C) 9 cm
(D) 10 cm
Answer:
(B) 8 cm

Question 2.
A point P is at a distance of 25 cm from the centre of a circle. The radius of the circle is 7 cm. Then the length of the tangent drawn from P to the circle will be—
(A) \(\sqrt {30}\) cm
(B) 24 cm
(C) 28 cm
(D) 30 cm
Answer:
(B) 24 cm

Question 3.
If all the four sides of a rhombus ABCD touch a circle then—
(A) AC + DA = BD + CD
(B) AB + CD = BC + DA
(C) AB + CD = AC + BC
(D) AC + AD = BC + BD
Answer:
(B) AB + CD = BC + DA

RBSE Class 10 Maths Important Questions Chapter 10 Circles

Question 4.
A line which cuts a circle in two points is called—
(A) chord
(B) Tangent
(C) Secant
(D) None of these
Answer:
(C) Secant

Question 5.
The maximum number of tangents that can be drawn from an external point to a circle is—
(A) One
(B) Two
(C) Three
(D) Infinitely many
Answer:
(B) Two

Question 6.
The tangents drawn at the ends of a diameter of a circle are—
(A) Perpendicular
(B) Parallel
(C) Intersecting
(D) None of these
Answer:
(B) Parallel

RBSE Class 10 Maths Important Questions Chapter 10 Circles

Question 7.
In the given figure AB and AC are tangents to the circle, O is the centre of the circle, if ∠CAB = 60°, then ∠BDC is—
RBSE Class 10 Maths Important Questions Chapter 10 Circles 1
(A) 60°
(B) 70°
(C) 120°
(D) 150°
Answer:
(A) 60°

Very Short Answer Type Questions—

Question 1.
In the given figure the circumcircle of △ABC touches the sides at Q, P and R. If AQ = 8cm, then find the perimeter of △ABC.
Solution:
We know that
RBSE Class 10 Maths Important Questions Chapter 10 Circles 2
AQ = \(\frac{1}{2}\) Perimeter (△ABC)
⇒ Perimeter (AABC) = 2 × AQ
= 2 × 8 = 16 cm.

Question 2.
In the given figure find the value of QS when it is given that OQ = 13 cm. and PQ = 12 cm.
Solution:
According to the figure PQ is a tangent.
RBSE Class 10 Maths Important Questions Chapter 10 Circles 3
∴ ∠OPQ = 90°
So now in △OPQ
(OP)2 + (PQ)2 = (OQ)2
⇒ (OP)2 + (12)2 = (13)2
⇒ (OP)2 = 169 – 144 = 25
∴ OP = \(\sqrt {25}\) = 5 cm.

RBSE Class 10 Maths Important Questions Chapter 10 Circles

Question 3.
In figure if TP and TQ are two tangents to circle with centre O such that ∠POQ = 150° then find the value of ∠PTQ.
RBSE Class 10 Maths Important Questions Chapter 10 Circles 4
Solution:
PT and TQ are tangents.
∴ ∠POQ + ∠PTQ = 180°
⇒ 130° + ∠PTQ =180°
⇒ ∠PTQ = 180° – 130° = 50°

Question 4.
In the given figure, from an external point A two tangents AB and AC are drawn to a circle. If ∠BAC = 48°, then write the value of ∠ABC.
RBSE Class 10 Maths Important Questions Chapter 10 Circles 5
Solution:
∠B + ∠C= 180° – 48°
= 132°
But ∠B = ∠C
∵ Tangents are equal in length.
∴ ∠ABC = \(\frac{132^{\circ}}{2}\)
= 66°

RBSE Class 10 Maths Important Questions Chapter 10 Circles

Question 5.
In the figure, AB, BC and CA are tangents to a circle. If BC = 6.3 cm and MC = 2.7 cm, then write the measure of BL.
Answer:
We know that
RBSE Class 10 Maths Important Questions Chapter 10 Circles 6
MC = NC
[The lengths of the tangents are equal.]
∴ BN = (6.3 – 2.7)
BN = 3.6 cm.
and BN = BL
∴ BL = 3.6 cm.

Question 6.
Two circles touch externally of the radii of the two circles are 5 cm and 3 cm, then write the distance between their centres.
Answer:
5 + 3 = 8 cm.

Question 7.
Two circles touch each other internally, then write the number of their common tangents.
Answer:
One.

RBSE Class 10 Maths Important Questions Chapter 10 Circles

Question 8.
In the given figure PA and PB are tangents to a circle. ∠APB = 40°, then write thd value of ∠AOB.
RBSE Class 10 Maths Important Questions Chapter 10 Circles 7
OR
It tangents RA and RB from a point R to a circle with centre O are inclined to each other at an angle of θ and ∠AOB = 40° then find the value of θ.
Answer:
∠AOB = 180° – 40° = 140°

Question 9.
In the given figure PBQ is tangent to a circle at point B. Write the value of ∠ABP.
RBSE Class 10 Maths Important Questions Chapter 10 Circles 8
Answer:
∠ABP = 90°

RBSE Class 10 Maths Important Questions Chapter 10 Circles

Question 10.
The length of a tangent drawn from any external point to a circle is 12 cm, if the radius of the circle is 5 pm, then find the distance of the external point from the centre.
Answer:
Distance = \(\sqrt{(12)^{2}+(5)^{2}}\)
= \(\sqrt {169}\)
= 13 cm.

Question 11.
In the given figure O is the centre of a circle. AB and AC are tangents to the circle. If OA = 10 cm and OB = 6 cm then write the length of AC.
RBSE Class 10 Maths Important Questions Chapter 10 Circles 9
Solution:
AB = \(\sqrt{10^{2}-6^{2}}\)
= \(\sqrt{100-36}\)
= \(\sqrt{64}\) = 8 cm
and AB AC So, AC = 8 cm.

RBSE Class 10 Maths Important Questions Chapter 10 Circles

Question 12.
In the figure TP and TQ are tangents to a circle with centre O. If ∠TOQ = 50°, then find ∠OTP.
RBSE Class 10 Maths Important Questions Chapter 10 Circles 10
Solution:
∵ QT is a tangent
∴ ∠OQT = 90°
From △OQT∠OTQ
= 180° – (∠OQT+ ∠QOT)
= 180° – (50° + 90°)
= 180° – 140° = 40°
∵ △QOT = △POT (∵ PT = QT)
∠P = ∠Q = 90°
or = OT
∴ ∠OTP = ∠OTQ
So, .∠OTP = 40°

Question 13.
How many tangents can be drawn at a point lying on the circumference of a circle.
OR
How many tangents can be constructed to any point on the circle of radius 4 cm?
Answer:
One and only one tangent can be drawn at any point lying on the circmference of a

RBSE Class 10 Maths Important Questions Chapter 10 Circles

Question 14.
In the given figure, if PA and PB are two tangents to a circle with centre O such that angle APB = 80°, then find the value of angle AOB.
RBSE Class 10 Maths Important Questions Chapter 10 Circles 11
Solution:
In the figure PA and PB are two tangents to a circle with centre O.
∴ ∠PAO = ∠PBO = 90°
and ∠APB = 80° [Given]
∴ ∠AOB = 360° – (90° + 90° + 80°)
= 360° – 260° = 100°

Question 15.
If from a point A, two tangents AB and AC to a circle with centre O are such that ∠BOC = 140°, then write the value of ∠BAC.
Solution:
In the figure, AB and AC are two tangents to a circle with centre O.
RBSE Class 10 Maths Important Questions Chapter 10 Circles 12
∴ ∠ABO = ∠ACO = 90°
and ∠BOC = 140° [Given]
∴ ∠BAC + ∠BOC = 180°
So ∠BAC = 360° – (90° + 90° + 140°)
= 360° – 320° = 40°

RBSE Class 10 Maths Important Questions Chapter 10 Circles

Question 16.
The tangent PQ at a point P of a circle with radius 1.5 cm meets a line. Through the centre O at point Q such that OQ = 13 cm, then find the length of PQ.
Solution:
Drawing figure according to the question
RBSE Class 10 Maths Important Questions Chapter 10 Circles 13
OP = 5 cm. and OQ 13 cm.
∵ PQ is a tangent and OP is a radius.
∴ ∠OPQ = 90°
Now in right △OPQ,
By Pythagoras Theorem,
(OQ)2 = (OP)2 + (PQ)2
Putting the value,
(13)2 = (5)2 + (PQ)2
or 169 = 25 + (PQ)2
or (PQ)2 = 169 – 25 = 144
or PQ = \(\sqrt {144}\) = 12 cm

Question 17.
If the tangents TA and TB drawn from a point T to a circle with centre O are inclined at an angle of 70° with each other, then find ∠AOB.
Solution:
RBSE Class 10 Maths Important Questions Chapter 10 Circles 14
According to the figure TA and TB are two tangents from any point T to a circle with centre O.
∴ ∠TAO = ∠TBO = 90°
and ∠ATB – 70°
∴ ∠AOB = 360° – (90° + 90° + 70°)
= 360° – 250°
= 110°

RBSE Class 10 Maths Important Questions Chapter 10 Circles

Short Answer Type Questions—

Question 1.
Prove that the length of two tangents drawn to a circle from any external point are equal.
OR
Prove that the lengths of the tangents drawn from an external point to a circle are equal.
RBSE Class 10 Maths Important Questions Chapter 10 Circles 15
In the given figure, O is the centre of a circle and two tangents KR, KS are drawn on the circle from a point K lying outside the circle. Prove that KR = KS.
RBSE Class 10 Maths Important Questions Chapter 10 Circles 16
Solution:
Given—The centre of the circle is O and two tangents from an external point R are RP and RQ.
To Prove RP = RQ
Construction : Join OP, OQ and OR
Proof : We know that a tangent line is perpendicular to the radius through the point of contact.
So, ∠OPR = ∠OQR = 90° …. (i)
Now in △OPR and △OQR,
∠OPR = ∠OQR | From equation (i)
OR = OR (Common side)
OP = OQ (radii of the same circle)
∴ By right angle – hypotenuse – side congruence property
△OPR ≅ △OQR
Therefore the corresponding sides of congruent triangles will be equal.
⇒ RP = RQ (Hence Proved)

Question 2.
Prove that in two concentric circles, the chord of the larger circle, which touches the smaller circle, is bisected at the point of contact.
Solution:
Given : We are given two concentric circles C1 and C2 with centre O and a chord AB of the larger circle C1 which touches the smaller circle C2 at the point P.
RBSE Class 10 Maths Important Questions Chapter 10 Circles 17
To Prove AP = BP
Construction : Join OP
Proof : AB is a tangent to C2 at P and OP is its radius. Therefore by theorem,
OP ⊥ AB
Now, AB is a chord of the circle C1 and OP ⊥ AB. Therefore, OP is the bisector of the chord AB, as the perpendicular from the centre to the chord bisects the chord,
i.e., AP = BP (Hence Proved)

RBSE Class 10 Maths Important Questions Chapter 10 Circles

Question 3.
Two tangents TP and TQ are drawn to a circle with centre O from an external point T. Prove that
∠PTQ = 2∠OPQ
Solution:
Given—We are given a circle with centre O, an external point T and two tangents TP and TQ to the circle, where P and Q are the points of contact, (see figure)
RBSE Class 10 Maths Important Questions Chapter 10 Circles 18
To Prove—∠PTQ = 2∠OPQ
Proof—∠PTQ = θ
Now by Theorem
TP = TQ
So, TPQ is an isoscles triangle.
So, ∠TPQ = ∠TQP = \(\frac{1}{2}\)(180° – θ)
= 90° – \(\frac{1}{2}\)θ
By Theorem, ∠OPT = 90°
So, ∠OPQ = ∠OPT – ∠TPQ
= 90°- (90° – \(\frac{1}{2}\)θ)
= \(\frac{1}{2}\)θ = \(\frac{1}{2}\) ∠PTQ
i.e., ∠PTQ = 2 ∠OPQ (Hence Proved)

Question 4.
If two tangent lines be drawn to a circle from an external point then prove that those lines subtend equal angles at the centre of the circle and also prove that both the tangent lines make equal angles with the line segment joining the centre of the circle to the external point.
Solution:
Given—A circle C (0, r) or which two tangent lines AP and AQ have been drawn from an external point A.
To Prove—(i) ∠AOP = ∠AOQ
(ii) ∠OAP = ∠OAQ
Construction—Join OA, OP and OQ
RBSE Class 10 Maths Important Questions Chapter 10 Circles 19
Proof—In △OPA and △OQA
AP = AQ
(Tangents to the same circle)
OA= OA (Common side)
OP = OQ (Radii)
By S-S-S Congruence
△OPA = △OQA
⇒ ∠AOP = ∠AOQ
and ∠OAP = ∠OAQ (Hence Proved)

RBSE Class 10 Maths Important Questions Chapter 10 Circles

Question 5.
Prove that the tangent lines drawn at the end points of any chord of a circle make equal angles with the chord.
Solution:
Let the tangents PA and PB be drawn at the end points of a chord AB of circle C(0, r) which intersect at point P.
RBSE Class 10 Maths Important Questions Chapter 10 Circles 20
Let OP intersect chord AB at point C.
To Prove— ∠PAC = ∠PBC
Proof—In △PCA and △PCB
PA = PB
| (Tangents lines from an external point P to the circle)
PC = PC (Common side)
∠APC = ∠BPC
| [∵ Tangent line PA and PB make equal angles with OP]
By S-A-S Congruence
△PCA ≅ △PCB
⇒ ∠PAC ≅ ∠PBC (CPCT) (Hence Proved)

Question 6.
Two tangent lines AB and AC are drawn to a circle with centre O from an external point O. Prove that ∠BAC = 2∠OBC.
Solution:
We are given a circle with centre O, an external point A and two tangent lines AB and AC to the circle, where B, C are the points of contact as shown in the figure.
RBSE Class 10 Maths Important Questions Chapter 10 Circles 21
To prove- ∠BAC = 2∠OBC
Let ∠BAC = θ
By Theorem we know that
AB = AC
So, ABC is an isosceles triangle
∴ ∠ABC = ∠ACB = \(\frac{1}{2}\)(180° – θ)
∠ABC = 90° – \(\frac{1}{2}\)θ
∠OBA = 90°
So ∠OBC = ∠OBA – ∠ABC
= 90° – (90° – \(\frac{1}{2}\)θ)
= 90° – 90° + \(\frac{1}{2}\)θ
∠OBC = \(\frac{1}{2}\)∠BAC
∴ ∠BAC = 2∠OBC Hence Proved

RBSE Class 10 Maths Important Questions Chapter 10 Circles

Long Answer Type Questions—

Question 1.
In the figure O is the centre of the circle and the tangent lines are PA and PB, then prove that AOBP is a cyclic quadrilateral.
RBSE Class 10 Maths Important Questions Chapter 10 Circles 22
Solution:
The tangent at any point of a circle is perpendicular to the radius through the point of contact.
Now OA ⊥ AP and OB ⊥ BP
⇒ ∠OAP = 90° and ∠OBP = 90°
⇒ ∠OAP + ∠OBP = 90° + 90°
⇒ ∠OAP + ∠OBP = 180° …. (i)
The sum of the angles of the quadrilateral OAPB is 360°.
∴ ∠APB + ∠BOA = 360° – (180°)
∠APB + ∠BOA = 180° …. (ii)
From equation (i) and (ii) it is clear that
∠OAP + ∠OBP = 180°
and ∠APB + ∠BOA – 180°
Here the sum of the opposite angles is 180°. Hence the quadrilateral OABP is a cyclic quadrilateral. (Hence Proved)

Question 2.
PQ is a chord of length 8 cm of a circle of radius 5 cm. The tangents at P and Q intersect at a point T. (see figure). Find the length TP.
Solution:
Join OT. Let it intersect PQ at the point R. Then ATPQ is isosceles and TO is the angle bisector of ∠PTQuestion So, OT ⊥ PQ and therefore, OT bisects PQ which gives
PR = RQ = 4 cm.
Also, OR = \(\sqrt{\mathrm{OP}^{2}-\mathrm{PR}^{2}}\)
= \(\sqrt{5^{2}-4^{2}}\) cm.
3 cm.
We can determine TP by Pythagoras Theorem as follows :
Let TP = x and TR = y then
In right △PRT,
(TP)2 = (TR)2 + (PR)2
(x)2 = y2 + (4)2
x2 = y2 + 16 ……(i)
RBSE Class 10 Maths Important Questions Chapter 10 Circles 23
In right △OPT
(OT)2 = (PT)2 + (PO)2
⇒ (TR + OR)2 = (x)2 + (5)2
⇒ (y + 3)2 = x2 + 25 …. (ii)
Subtracting equation (i) fr om equation (ii)
x2 + 25 – x2 = (y + 3)2 – y2 – 16
⇒ 25 = y2 + 6y + 9 – y2 – 16
⇒ 25 = 6y – 7
⇒ 6y = 32
y = \(\frac{32}{6}\) = \(\frac{16}{3}\)
From equation (i)
RBSE Class 10 Maths Important Questions Chapter 10 Circles 24

RBSE Class 10 Maths Important Questions Chapter 10 Circles

Question 3.
A line intersecting two tangent lines PA and B from any external point P to a circle touches the circle at point M, then prove that
PL + LM = PN + NM
OR
In figure PA and PB are tangent lines of a circle. If M be a point on the circle, then prove that
PL + LM = PN + NM
RBSE Class 10 Maths Important Questions Chapter 10 Circles 25
Solution:
Given—A circle where centre is OP is a point and side the circle, PA and PB are two tangent lines. M is any point on the circle. Line segment LN passes through the point M.
To Prove— PL + LM = PN + NM
Proof : Two tangent lines PA and PB are drawn from P to a circle.
∴ PA = PB
or PL + LA = PN + NB …. (i)
LA and LM are two tangent lines to the circle from point L
∴ LA = LM …. (ii)
Similarly, NB = NM …. (iii)
From (i), (ii) and (iii)
PL + LM = PN + NM (Hence Proved)

RBSE Class 10 Maths Important Questions Chapter 10 Circles

Question 4.
The circle drawn with side AB of a right angled triangle ABC as diameter intersects the hypotenuse AC at P. Prove that the tangent to the circle at point P intersects the side BC.
Solution:
To Prove : BQ = QC,
Where Q is the point of intersection of tangent drawn at P and BC.
RBSE Class 10 Maths Important Questions Chapter 10 Circles 26
Construction—Join BP
Proof— AB is a diameter of the circle.
∴ ∠APB = 90°
(Angle in a semi-circle is a right angle)
∴ ∠APB + ∠BPC = 180°
∴ 90° + ∠BPC = 180°
∴ ∠BPC = 90° …. (i)
∵ In △ABC ∠ABC = 90°
∴ ∠BAC + ∠ACB = 90° …. (ii) (∵ The sum of the three angles of a triangle is 180°.)
From equations (i) and (ii)
∠BPC = ∠BAC + ∠ACB
or ∠BPQ + ∠CPQ = ∠BAC + ∠ACB …. (iii)
But ∠BPQ = ∠BAC
(Angle in the alternate segment)
∴ From equation (iii)
∠CPQ= ∠ACB
⇒ ∠CPQ = ∠PCQ
(∵ ∠ACB = ∠PCQ)
∴ PQ=QC …. (iv)
Again PQ= QB …. (v)
(Tangent lines drawn from an external point to a circle are equal.)
∴ From equations (iv) and (v)
QC= QB
Hence, PQ intersects BC.

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