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AB,BC,CD are three consecutive sides of a regular polygon.if angle BAC=20degree find the measure of one exterior.find the no of sides.(please do it step-by step otherwise i can't understand)
angle BAC = 200

So angle BCA = 200 (BA =BC)


angle ABC = 180-40(angle sum property of a triangle)

                     =140 0 
So one  exterior angle = 180 -140 = 40


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