Wong YX's answer to Snoopy's Secondary 3 E Maths Singapore question.
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You can solve using Cosine Rule:
a² = b² + c² - 2bc cos A
In this case, it would be:
PR² = QR² + PQ² - 2(QR)(PQ) cos ∠PQR
QR and PQ are interchangeable. Just plug in the number accordingly and remember to square root the answer to get PR.
If you do it right, you should get 162 m correct to 3 s.f.
a² = b² + c² - 2bc cos A
In this case, it would be:
PR² = QR² + PQ² - 2(QR)(PQ) cos ∠PQR
QR and PQ are interchangeable. Just plug in the number accordingly and remember to square root the answer to get PR.
If you do it right, you should get 162 m correct to 3 s.f.
Date Posted:
2 years ago
THANK YOU :D
No prob.
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