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Transcript

Rotational symmetrySuppose we have a fan let’s rotate it around the center (marked as red cross) And suppose it rotate 120° The figure looks the same as previous Now, suppose it rotates again 120° The figure looks the same as previous The figure is same as previous Now, suppose it rotates again 120° Thus, 120° + 120° = 240° 240° + 120° = 360° Thus, in 1 full turn (i.e 360°) The figure is same as that of initial 3 times So, we say that figure has rotational symmetry of order 3 And the point where it rotate is called Point of rotation. We donate it with a cross X Fan with 4 bladesFor a fan with 4 blades Suppose it rotates 90° about center The figure looks the same as previous Now, suppose it rotates again 90° The figure is same as previous Now, suppose it rotates again 90° The figure is same as previous Suppose it rotates again 90° The figure is same as previous Thus, Initial figure Thus, in 1 full turn (i.e 360°) The figure is same as that of initial 4 turns So, we say that figure has rotational symmetry of order 4

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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 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.