to proove : ABCD is a rectangle
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Data : ABCD is a cyclic quadrilateral and AC and BD are diameters of the circle.
PROOF: In the figure AC and BD are the diameter.
angle ABC=90⁰ (semicircle)
angle BCD=90⁰ (semicircle)
angle CDA=90⁰ (semicircle)
angle DAB=90⁰ (semicircle)
Therefore ABCD is a rectangle
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