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△PQR की भुजाओं PQ और PR पर क्रमशः बिंदुएँ E और F स्थित हैं। यदि PE = 6 सेमी., QE = 6.6 सेमी., PF = 9 सेमी. तथा RF = 9.9 सेमी. हैं, तो सिद्ध करें कि EF || QR है।

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△PQR की भुजाओं PQ और PR पर क्रमशः बिंदुएँ E और F स्थित हैं

प्रश्न से, 

PE = 6 cm, QE = 6.6 cm,

PF = 9 cm, RF = 9.9 cm

\(\therefore \frac{P E}{Q E}=\frac{6}{6.6}=\frac{1}{1.1}=\frac{10}{11}\)

\(\frac{P F}{R F}=\frac{9}{9.9}=\frac{1}{1.1}=\frac{10}{11}\)

\(\therefore \frac{P E}{Q E}=\frac{P F}{R F}\) 

अतः थेल्स के विलोम से, EF || QR Proved.

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