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90 = 3x
30 = x
<PRQ = x = 30 derajat
=360 - 90 = 3x
=270 = 3x
=270 : 3 = x
=90=x
b. <PRQ = 2x
=x = 90
=2x = 90 X 2
=<PRQ = 180 derajat ..