The angle of rotation for the figure 12.2 is
(a) 45°
(b) 60°
(c) 90°
(d) 180°

Solution:

Symmetry is defined for objects or shapes which are exactly identical to each other when placed one over the other.

An object when rotated in a particular direction, around a point exactly similar to the original object, is known to have rotational symmetry.

When a geometrical shape is turned, and the shape is identical to the origin, it is known to exhibit rotational symmetry.

We know that

The angle of rotation for the square is 90°

Therefore, the angle of rotation is 90°.

✦ Try This: What is the angle of rotation of an equilateral triangle

☛ Also Check: NCERT Solutions for Class 7 Maths Chapter 14

NCERT Exemplar Class 7 Maths Chapter 12 Sample Problem 3

The angle of rotation for the figure 12.2 is: (a) 45°, (b) 60°, (c) 90°, (d) 180°

Summary:

The angle of rotation for the figure 12.2 is 90°.

☛ Related Questions:

• The figure 12.3 has ________ vertices, __________ edges and __________ faces.
• The adjoining net in Fig. 12.4 represents a _________.
• Rotation turns an object about a fixed point. This fixed point is called _______.