Question

50 poin,
TOLOG PAKE CARA YAA KAK, KALO ENGGAK AKU LAPORIN LHOO

Answer 1

QR² = PR² + PQ² - 2 x PR x PQ x cos 60°
QR² = 6² + 9² - 2 x 6 x 9 x 
QR² = 117 - 54
QR² = 63
QR = √63
QR = 3√7 cm (B)

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Answer 2

QR = p

PR = q = 6 cm, PQ = r = 9 cm
∠P = 60°

maka kita mencari p menggunakan aturan cosinus

p² = q² + r² - 2qr cos P
⇒ p² = 6² + 9² - 2(6)(9) cos 60°
⇒ p² = 36 + 81 - 2(6)(9)(1/2)
⇒ p² = 36 + 81 - 54
⇒ p² = 63
⇒ p  = √63
⇒ p  = √9 · √7
⇒ p  = 3√7 cm
⇒ QR = 3√7 cm


Jawab : B


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