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ABCDEFGH is a regular octagon. The minimum degree of rotation by which this octagon can map onto itself is °. It will take increments of that degree of clockwise rotation for A′ (the image of A) to coincide with C.

 Jun 29, 2021
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See if this helps:     Interior angle for a polygon =  ( n-2) *180 /n    for octagon this equals 135o

   EXTERIOR angle for the octogon is then  180 - 135 = 45o

 

 

 Jun 29, 2021

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