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Transcript

Ex 12.2, 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° 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 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.