Question

9. In APQR , if A) 45°B) 60° C) 80'D) 90° PQ=10 cm, QR= 8 cm and PR=6 cm then , R =​

Answer 1

Answer:If PQ = 10 cm and PR = 24 cm, find QR. Solution1 : Let the RQ be x cm,. In right angle triangle PQR,

Step-by-step explanation:

Answer 2

These questions are solved using a rule, cosine rule

Here,

cosR = QR² + PR² - PQ²

2(QR)(PR)

= 8² + 6² - 10²

2(8)(6)

= 0

So, cosR = 0

Hence, ∠R = π/2, or 90°

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