15. In AABC, AB = AC and CP 1 AB. Prove that
(1) 2AB.BP = BC (ii) CP2 - BP2 = 2AP BP
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Step-by-step explanation:
Given ABC is a trianlge in which AB=AC . P is any point in the interior of the triangle such that angle ABP=ACP
In ΔAPB and ΔAPC,
AB=AC[given]
∠ABP=∠ACP [given]
AP=AP[common]
ΔAPB≅ΔAPC[by SAS congruency criterion]
∴∠PAB=∠PAC [corresponding angles of congruent trianlges]
thus, BP=CP
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