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Question

In the given figure, AB || CD. If ∠APQ = 70° and ∠PRD = 120°, then ∠QPR = ?
(a) 50°
(b) 60°
(c) 40°
(d) 35°

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Solution

(a) 50°

ABCD and PQ is the transversal.
PQR=APQ=70° Alternate Interior Angles
Side QR of traingle PQR is produced to D.
PQR+QPR=PRD70°+QPR=120°QPR=50°

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