Question

prove that : rectangle is a cylic quadrilateral ​

Answer 1

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ABCD be a cyclic quadrilateral such that its diagonals AC and BD are the diameters of the circle through the vertices A, B, C, and D.

<ABC = 90° and  < ADC = 90°

 Similarly, BD is a diameter.

  <DAB = 900  and  <BCD = 90°

  Therefore,  < ABC = <ADC = <DAB = <BCD = 90°

Thus, ABCD is a rectangle

Answer 2

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