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3x = 180 - 90
3x = 90
x = 90 : 3
= 30
sudut PRQ = 2x
= 2(30)
= 60
2x+x+90 = 180
2x+x. = 180 - 90
3x. = 90
x. = 30
PRQ = 2x
2 × 30 = 60