एक चतुर्भुज ABCD में, angleB = 90^(@) ह...

एक चतुर्भुज ABCD में, `angleB = 90^(@)` है यदि `AD^(2) = AB^(2) + BC^(2) + CD^(2)` हो तो सिद्ध कीजिए कि `angle ACD = 90^(@)`

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In the figure angle B = 90^(@) , AD^(2) = AB^(2) + BC^(2) + CD^(2) . Prove angle ACD = 90^(@) .

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