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PLEASE EXPLAIN CLEARLY.

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Any object or shape is said to have rotational symmetry if it looks exactly the same at least once during a complete rotation through 360°.  

Centre of rotation 

The fixed point about which an object rotates is called the centre of rotation. During the rotation, the shape and size of the object do not change. Rotation may be clockwise or anti-clockwise.

A full turn refers to a rotation of 360°. A half turn refers to a rotation of 180°. A quarter turn refers to a rotation of 90°.  

Angle of rotation : The angle at which a shape or an object looks exactly the same during rotation is called the angle of rotation.

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