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<P = <R = 112 derajat
360 = 112 + 112 + 3x + x
360 = 224 + 4x
360 - 224 = 4x
136 = 4x
136 / 4 = x
34 = x
<PQR = 3x = 3 * 34 = 102 derajat
4x = 180
x = 45
sudut PQR = 3x = 3 . 45 = 135