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sudut 1 = 3x-7
sudut 2 = 2x+3
sudut 3 = 4x-5
jumlh sudut segitiga = 180
maka :
180 = sudut (1+2+3)
180 = 3x-7 + 2x+3 + 4x-5
180 = 9x-9
9x = 180-9
x = 171/9
x = 19⁰
b. besar masing2 :
sudut 1 = 3x-7 = 3x19 - 7 = 50⁰
sudut 2 = 2x+3 = 2x19 + 3 = 41⁰
sudut 3 = 4x-5 = 4x19 - 5 = 71⁰
untuk nilai x
(3x - 7)+(2x + 3)+(4x - 5) = 180
(9x - 9 = 180):9
x = 21
besar sudut masing2 tinggal subtitusi nilai x ke persamaan masing2 sudut