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10x = 180 - 40 + 80
10x = 220
x = 22°
Sudut₁ = 22° × 5
Sudut₁ = 110°
Sudut₂ = 22° + 40°
Sudut₂ = 62°
Sudut₃ = 88° - 80°
Sudut₃ = 8°
sudut 1 = 5x
sudut 2 = x+40
sudut 3 = 4x-80
jumlh sudut segitiga = 180
maka :
180 = sudut (1+2+3)
180 = 5x + x+40 + 4x-80
180 = 10x - 40
10x = 180+40
x = 220/10
x = 22
jadi :
sudut 1 = 5x = 5 x 22 = 110
sudut 2 = x+40 = 22 + 40 = 62
sudut 3 = 4x-80 = 4x22 - 80 = 8