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besar total sedut segitiga = 180
besar ABC dan BAC = 180 - 80 = 100 derajat
besar sudut garis lurus = 180
maka :
180 - 8x + 180 - 5x = 100
360 - 13 x = 100
13x = 360-100
x = 260/13
x = 20 derajat
subtitusi nilai x = 20 deraja, diperoleh
besar ABC = 180 - 5(20)
= 180 - 100
= 80 derajat