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B= x = 30
C=2x = 2 (30)
= 60
maka, penyelesaian:
2x + x = 90
3x=90
x=90 /3
x = 30
berarti sudut CAB = x
semua sudut pada segitiga ABC = ...?
Σsudut segitiga ABC = sudut ABC + sudut BCA + sudut CAB
180° = 2x + 2x + x
180° = 5x
x = 36°
sudut ABC = 2x = 2 x 36° = 72°
sudut BCA = sudut ABC = 72°
sudut CAB = 36°
Jadi, besar masing - masing sudut pada segitiga ABC berturut - turut ialah 72° (sudut ABC), 72° (sudut BCA), dan 36° (sudut CAB)