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  1. Chapter 14 Class 7 Symmetry
  2. Serial order wise

Transcript

Ex 14.2, 2 (f) Give the order of rotational symmetry for each figure: In case of regular pentagon, We rotate it about the center Let’s rotate it by 72° The figure looks the same as previous Angle at center = (360°)/5 = 72° Now suppose it rotates by 72° again The figure looks the same as previous Again it rotates 72° The figure looks the same as previous Once again, it rotates 72° The figure looks the same as previous Suppose, it again rotates by 72° The figure looks the same as previous Thus, Thus, The figure is same as that of initial 5 turns. So, we say that figure has rotational symmetry of order 5.

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.