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DABC is an iso seles trianglein which AB = Ac side Bo to poolused to p such hat AP > AB• (see figus esa o |
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Answer» AB = ADAB = ACSO, AC = ADIn triangle ABC,BCA = ABC ........1In triangle ADC,ACD = CDA .......2From 1 and 2 we get,BCA + ACD = ABC + CDAor, BCD = ABC + CDA ......3Now,BCA + ABC + CDA = 180°[sum of all angles]or, BCA + BCA = 180°[From 3]or, 2BCA = 180°or, BCA = 90°Therefore BCD is a right angled triangle....Proved. |
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