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Question

In figure 5.55 PQRS is a parallelogram, in which A is mid-point of side SR and point B is a point on diagonal PR. such that RB = 14PR. Also, AB when produced meets QR at C. Prove that, point C is mid-point of side QR.

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Solution

Given:PQRS is a parallelogram.A is the midpoint of SR.RB=14PR ...(i)We know that the diagonals of a parallelogram are equal and bisect each other.RO = OPPR=2ORSo, RB=14×2ORor, RB =12RO Consider RSO,B is mid point of ROA is mid point of SRAB SO (By midpoint theorem)Also, B is extended to C and O to Q.AC SQ Now, consider ROQ.BCOQ and B is the mid point of RO.By the converse of midpoint theorem, C is the midpoint of RQ.

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