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= 1/2x180
= 90 derajat
nilai x = 2x+3x+90=180
5x+90=180
5x=180-90
x=90/5
x=18
sudut A= 90
sudut C= 2x=2(18)=36
sudut B= 3x=3(18)=54
jadi sudut ABC= 90+36+54
=180 derajat