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Please

 Nov 29, 2018
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Since AB = BC......the angles opposite those sides are equal   = x

 

So....angle B    =  180 - 2x

 

But....the sum of angles B and D =  (180 -2x) + 2x  =  180°

 

And when opposite sides of a  quadrilateral are supplementary [ sum to 180° ], the quadrilateral is a cyclic quadrilateral

 

 

cool cool cool

 Nov 29, 2018

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