total sudut segitiga=180°
a+b+35°=180°
a+b=180°-35°
a+b=145°
(x+18°)+(2x+1)=145°
3x + 19° =145°
3x=145°-19°
3x=126°
x=126°/3
x=42°
ΔBAC= x±18°
=42°+18°
=60°
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total sudut segitiga=180°
a+b+35°=180°
a+b=180°-35°
a+b=145°
(x+18°)+(2x+1)=145°
3x + 19° =145°
3x=145°-19°
3x=126°
x=126°/3
x=42°
ΔBAC= x±18°
=42°+18°
=60°