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Ex 14.2, 2 (b) Give the order of rotational symmetry for each figure: Here, ∠AOB = 80° But, ∠AOB + ∠BOC = 180° 80° + ∠BOC = 180° ∠BOC = 180° − 80° ∠BOC = 100° Also, ∠AOB = ∠COD = 80° And ∠BOC = ∠ AOD = 100° Given (Linear pair) (Vertically opposite Angles) If rotated by 80° This figure doesn’t look same as previous If rotated by 90° This figure doesn’t look same as previous If rotated by 180° This figure looks same as previous Again rotated by 180° This figure looks same as previous Thus, Thus, in 1 full turn (i.e. 360°) This figure is same as that of initial 2 turns So, we say that this figure has rotational symmetry of order 2

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.