Page 137 - ICSE Math 5
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Half turn
A half turn refers to a rotation of 180°.
Look at the given shape.
Put a dot on top of the shape and give it a half turn.
With the help of the dot, we can see that the shape forms an angle of 180° and 180°
looks the same after a half turn. Thus, it shows rotational symmetry.
Some other shapes that show rotational symmetry after a half turn are shown below.
Some shapes that look different after a half turn are given below.
Full turn
A full turn refers to a rotation of 360°.
Look at the given shape.
Put a dot on top of the shape and give it a full turn as shown.
With the help of the dot, we can see that the shape forms an angle of 360° and looks exactly the
same after a full turn. Thus, it shows rotational symmetry.
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