Prove that a cyclic parallelogram is a rectangke

1.	Prove that a cyclic parallelogram is a rectangke
Answer» .Given. = parallelogram is cyclic To prove =angle 4 is 90Proof= angle B= angle D------1 (opposite angle )B+D= 180 (sum of opposite side of parallelogram)Angle B+Angle B =180 (from 1)2angle B=180Angle B = 90

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