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B : 90
C : 180 - (60 + 90) = 30
A+B = 150
A:B:C = 60 : 90 : 30 = 2 : 3 : 1
3) 180 = 65 + 2x + 3x
115 = 5x , x = 23
PQC = 3 x 23 = 69
QPC = RQP (bersebrangan dalam)
180 = 69 +65 + BQR
180 = 134 + BQR
BQR = 46
4) P penyiku Q
90 = P + Q