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sudut segitiga = 2x , 3x , dan 4x
jumlah sudut segitiga adalah 180 derajat
maka :
2x+3x+4x = 180
9x = 180
x = 180 / 9
x = 20 derajat
jadi besar masing2 :
2x = 2 x 20 = 40
3x = 3 x 20 = 60
4x = 4 x 20 = 80
besar sudut segitiga = 2x⁰ + 3x⁰ + 4x⁰ = 180⁰
=9x⁰ = 180⁰
x=180 : 9
x = 20
sudut pertama = 2x⁰ = 2(20) = 40⁰
sudut kedua = 3x⁰ = 3(20) = 60⁰
sudut ketiga = 4x⁰ = 4(20) = 80⁰