If a figure is rotated by 180o the figure looks exactly same then it has rotational symmetry of order ______ .
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(a) After rotating through an angle of 120 degrees through its centre of symmetry the figure looks exactly the same as its original. At what other angles will it happen for the figure? Describe with an example. (b) What is the order of rotational symmetry? (c) What is the order of rotational symmetry of a semi-circle? [4 MARKS]
If a figure is rotated around its centre point through an angle less than ______ and the figure still appears unchanged then the figure has a rotational symmetry.