Page 2 - Home Assignment -Introduction-Ch-13 Exponents ane powers

Order of Rotational symmetry = 360 / ANGLE OF ROTATION

Rotational Symmetry Letters: There are many capital letters of English alphabets
which has symmetry when they are rotated clockwise or anticlockwise about an axis.
 Some of them are: Z, H, S, N and O. When these letters are rotated 180
degrees clockwise or anticlockwise the letters appears to be same.

Examples of Rotational Symmetry:

 A paper windmill is a perfect example of symmetry.
 In a paper windmill, there is no line of symmetry, neither can it be folded.
Paper windmill shows rotational symmetry. It is fixed a stick by a pin.

 The angle at which this paper mill is turned is called the angle of rotation.
Here the angle of turn is 90°. A full turn of rotation measures 360°. So for
taking one full turn, our paper windmill is moved four times.
 So, it has a rotational symmetry of order 4.