ABCDand ABCD are right-angled triangles. _BAC = 90°. _BDC = 90°, and AC = BD. Prove that ∆ABC~ ∆ABC
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In △APB and △DPC, we have
∠A=∠D=90∘ and
∠APB=∠DPC [Vertically opposite angles]
Thus, by AA-criterion of similarity, we have
△APB∼△DPC
⇒ DPAP=PCPB
⇒ AP×PC=DP×PB [Hence proved]
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