Answer:
B
Step-by-step explanation:
CosA = AB/AC = 12/20 = 3/5
3306.5
The choice;
I hope I helped you^_^
7
Sum of all three angle in a triangle=180
Given angles are 35°,45°
Let the remaining angle =x
So 35 +45+X=180
X=180-80
X=100°
Remaining angle =X=100° is the answer