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P + R = 90'
( 3x + 11 )' + ( x + 7 ) = 90'
3x + 11 + x + 7 = 90'
4x + 18 = 90'
4x = 90 - 18
4x = 72
x = 18
sudut P
3x + 11 =
3.18 + 11 =
54 + 11 = 65' jawabnya D