Rotational Symmetry

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  • Q1

    In the given figure, the order of rotational symmetry is

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    Answer:

    2.

    Explanation:

    In the given figure, there are precisely two positions of rotation through the angles 180° and 360°.

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  • Q2

    If after a rotation an object looks exactly the same, then it is known as

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    Answer:

    rotational symmetry.

    Explanation:

    Rotation may be clockwise or anti-clockwise.


    In the above figures, a point ‘A’ is rotated by 90° and after completing a full-turn point ‘A’ reaches its original position.

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  • Q3

    The degree measure of the angle of rotation for a quarter-turn will be

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    Answer:

    90°.

    Explanation:

    A quarter-turn means rotation by 90°. 

            

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  • Q4

    The degree measure of the angle of rotation for a half-turn is

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    Answer:

    180°.

    Explanation:

    A half-turn means rotation by 180°. 

              

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  • Q5

    A figure which has both linear symmetry and a rotational symmetry is a

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    Answer:

    circle.

    Explanation:

    A circle can be rotated around its centre through any angle and at the same time it has multiple lines of symmetry.

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