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jumlah sudut dlm segitiga = 180 derajat
180 = x + 2x + 9 + 2x - 9
180 = 5x
x = 180/5
x = 36
a) x = 36 derajat
b) 2x + 9 = (2 x 36) + 9 = 72 + 9 = 81 derajat
c) 2x-9 = (2x36) - 9 = 72-9 = 63 derajat
Sudut (2x+9) = 81 derajat
Sudut (2x -9) = 63 derajat