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आकृति में ΔABC के अभ्यंतर में स्थित कोई बिंदु O है तथा OD⊥BC, OE⊥AC और OF⊥AB है। दर्शाइए कि
(i) OA2 + OB2 + OC2 - OD2 - OE2 - OF2 = AF2 + BD2 + CE2,
(ii) AF2 + BD2 + CE2 = AE2 + CD2 + BF2

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