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How many positions are there at which the triangle looks exactly the same, when rotated about its centre by 120^o ?

1.(b) How many positions are there at which the triangle looks exactly the same, when rotated about its centre              by 120°?

             

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All the triangles look same when rotated by 120 \degree. Thus, there are 4 positions at which the triangle looks exactly the same when rotated about its centre by 120°.

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