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10 x = 180
x = 180 / 10 = 18
jadi sudut R = 3x = 3 x 18 = 54 derajat
17) 180 - ((180 - 138) + (180 - 152))
180 - (42 + 28)
180 - 70 = 110 derajat
18) 180 - (34 x 2)
180 - 68 = 112 derajat