RBSE Solutions for Class 7 Maths Chapter 11 Symmetry Additional Questions

RBSE Solutions for Class 7 Maths Chapter 11 Symmetry Additional Questions is part of RBSE Solutions for Class 7 Maths. Here we have given Rajasthan Board RBSE Class 7 Maths Chapter 11 Symmetry Additional Questions.

Board	RBSE
Textbook	SIERT, Rajasthan
Class	Class 7
Subject	Maths
Chapter	Chapter 11
Chapter Name	Symmetry
Exercise	Additional Questions
Number of Questions	16
Category	RBSE Solutions

Rajasthan Board RBSE Class 7 Maths Chapter 11 Symmetry Additional Questions

Multiple Choice Questions

Question 1
Number of symmetry (RBSESolutions.com) lines in M :
(A) 1
(B) 2
(C) 3
(D) 4

Question 2
Number of lines in an equilateral haxagon will be:
(A) 7
(B) 6
(C) 8
(D) 10

Question 3
In the given figure number (RBSESolutions.com) of symmetry line

(A) 2
(B) 4
(C) 8
(D) Infinite

Question 4
In the figures given below which is (RBSESolutions.com) symmetric of one line shape :

(A) only (i)
(B) only (ii)
(C) only (iii)
(D) (i) and (iii) both

Question 5
In the three rotation of equilateral (RBSESolutions.com) triangle every rotational angle will be
(A)120°
(B) 90°
(C)240°
(D)360°
Answer:
1. (A), 2. (B), 3. (B), 4. (D), 5. (A)

Fill in the blanks :
(i) A line on which both sides figures are same then it is called ………
(ii) Semi circle is having ………… symmetric line.
(iii) The angle on which object rotates is called ………….
Answer:
(i) symmetric axis
(ii) one
(iii) rotation.

True/False
(i) Equilateral polygons are having (RBSESolutions.com) same sides and same angles and having more than one symmetry line.
(ii) In mirror due to reflection the edges of object is shifted towards right direction.
(iii) In one complete revolution (360°) object appears to be original shape is known as rotational symmetry.
Answer:
(i) True
(ii) False
(iii) True

Short Answer Type Questions

Question 1
Which type of rotation (RBSESolutions.com) is in cycle wheel.
Solution:
Cycle wheel is having clockwise and anti clock wise both rotations.

Question 2
What do you mean by symmetry?
Solution:
If any object is divided in two halves by a point or dotted line and each halves match each other exactly then it is called symmetry.

Question 3
Which english alphabets are (RBSESolutions.com) having symmetry as per following reflection
(a) Vertical mirror
(b) Horizontal mirror
(c) Vertical and Horizontal mirror
Solution:
(a) In a vertical mirror english alphabets reflection alphabets are following:
A, H, I, M, O, T, U, V, W, X, Y
(b) in horizontal direction following english alphabets are symmetrical
B, C, D, E,H, 1,0 and X
(c) Following english alphabets are having vertical and horizontal symmetry H, I, O and X.

Question 4
Give three examples of such (RBSESolutions.com) shapes which does not have any line symmetry.
Solution:
Example of three shapes which does not have line symmetry are
(i) Scalane triangle
(ii) Parallelogram
(iii) A non-regular quadrilateral

Question 5
Can you give other names for (RBSESolutions.com) line of symmetry in following shapes
(a) Isosceles triangle
(b) A circle
Solution:
Name of other symmetry line
(a) Median in isosceles triangle
(b) Diameter of circle

Long Answer Type Questions

Question 1
Write the order for following (RBSESolutions.com) rotational symmetry.

Solution:
Write the point A and angle will be (RBSESolutions.com) marked as x and rotation will be as follows:

Find out the rotational symmetry :

• Figure (a) and (b) It requires two rotation (RBSESolutions.com) and every rotation will be by 180° which rotates around (x) will come in its original position means order of symmetry will be 2.
• Figure (c) In triangle three rotation is required each rotation will be 120° which rotates around (x) will reach in its original position it has order 3 rotational symmetry.
• Figure (d) and (e) require 4 rotation each rotation will be 90° which rotates around (x) and will acquire its original position. So the order of symmetry will be 4.
• Figure (f) equilateral pentagon which requires S rotation in which each of 72° and after S rotation of 72° It will be in its original position. So order will be 5.

Question 2
In the following figures identify the (RBSESolutions.com) various symmetry lines if it has.

Solution:
In the given figures lines (RBSESolutions.com) of symmetry

Question 3
Write the number of symmetry (RBSESolutions.com) lines in the following figures
(a) Equilateral Triangle
(b) Isosceles Triangle
(c) Scalene Triangle
(d) Square
(e) Rectangle
(f) Equilateral Quadrilateral
(g) Parallelogram
(h) Quadrilateral
(i) Equilateral hexagon
(j) Circle
Solution:

Shape	No of symmetry
(a) Equilateral Triangle	3
(b) Isosceles Triangle	1
(c) Scalene Triangle	0
(d) Square	4
(e) Rectangle	2
(f) Equilateral Quadrilateral	2
(g) Parallelogram	0
(h) Quadrilateral	0
(i) Equilateral hexagon	6
(j) Circle	Infinity

Question 4
Write the number of summary axis in (RBSESolutions.com) the following figures.

Solution:
(i) When triangle is folded in vertical line then it is divided in two parts which are symmetrical. So number of symmetrical axis is one.
(ii) If the given figure is folded on vertical line then it makes two symmetrical figures, The same situation will occur in horizontal axis also. So the number of symmetrical axis is 2.
(iii) In the given figure if it is folded vertical (RBSESolutions.com) then it shows symmetrical and if is folded orizonontal then also it shows symmetry, if it is folded about other dotted lines it also shows symmentry.
So number of symmentrical axis is 4.

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