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3x = 180 -90
3x = 90
x = 90/3 = 30derajat
besar sudut PQR : sudut yang berhadapan dengan diameter membentuk siku2, jadi sudut PQR = 90 derajat
B. Sudut PRQ = 180 - 90 - 30 = 60 derajat
2x + 90 + x = 180
3x = 180 - 90
3x = 90
x = 30°
maka <PRQ = 2x
= 2(30)
= 60°