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sudut 1 = 5a
sudut 2 = a+40
sudut 3 = 4a+80
jumlh sudut segitiga = 180
maka :
180 = sudut (1+2+3)
180 = 5a + a+40 + 4a+80
180 = 10a + 120
10a = 180-120
a = 60/10
a = 6 derajat
b. besar sudut :
sudut 1 = 5a = 5 x 6 = 30
sudut 2 = a+40 = 6 + 40 = 46
sudut 3 = 4a+80 = 4x6 + 80 = 104
c. jenis segitiga segitiga sembarang, atau segitiga tumpul
a = 6 derajat