एक triangle ABC में, यदि AD, BC के लंबवत...

एक `triangle ABC` में, यदि AD, BC के लंबवत है तो सिद्ध कीजिए कि
(i) `AB^(2) + CD^(2) = AC^(2) + BD^(2)`
(ii) `AB^(2) - BD^(2) = AC^(2) - CD^(2)`

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