​Experts, pls help with 1st 3 parts along with explanation. Can't understand from study                material and school. 

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Order of Rotational symmetry= (a) 2 (b) 4 (c) 3 (d)  4 (e) 4 (f) 5 (g) 6 (h) 3
Angle of Rotational symmetry= (a) 180 (b) 90 (c) 120 (d) 90 (e) 90 (f) 72 (g) 60 (h) 120


I think it will help you. Thank you :-) 
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reffer in book
 
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sorry
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