Sebuah segitiga PQR diketahui panjang PQ = 8 cm panjang QR = 10 cm dan B sudut PQR = 30°, Luas segitiga PQR adalah .....
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Jawaban:
luas segitiga PQR= 1/2 PQ. QR sin sudut PQR
= 1/2 .8.10 sin 30
= 4. 10. 1/2
= 20