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Ada sudut, 15, 120 (Pelurus 60) sama 45 (Pelurus jumlah 120 dengan 15)
Aturan sin,
6.
Agar memudahkan,
PR = q
PQ = r
QR = p
p+q = 6
p = 6-q
P = 30', Q = 60', R = 90'
Aturan sin
7.