In the adjoining figure, P and Q are two points on equal sides AB and AC of an isosceles triangle ABC such that AP = AQ.
Prove that BQ = CP.

Figure

Given: AB=AC ABC is an isosceles triangle.AP= AQTo prove:BQ=CPProof:AB=AC   (given)AP=AQ   (given)AB-AP=AC-AQ =>BP=CQABC=ACB     (angle opposite to the equal sides are equal)=>PBC=QCBIn PBC andQCB:PB=QC       (proved above)PBC=QCB    (proved above)BC=BC        (common)By SAS congruence property:PBC QCBBQ=CP         (corresponding parts of the congruent triangles)

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