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Question

In a triangle PQR, ST is parallel to QR Show that RT(PQ + PS) = SQ (PR + PT)
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Solution

PQR is a triangle. ST is parallel to QR
By basic proportionality theorem in ΔPQR
PQPS=PRPT
By componendo and dividendo
PQPS=PRPTPQ+PSPQPS=PR+PTPRPT
PQ+PSSQ=PR+PTTR
RT(PQ+PS)=SQ(PR+PT)

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