Question

In ABC, B = 90º, AC = 12 cm, BC = 6 cm. Find measure of A

Answer 1

Step-by-step explanation:

AC²=AB²+BC²

(12)²=(6)²+BC²

BC=108

BC= root 108 = 6 root 3

Sin A= 6 root 3/ 12

Sin A = root 3/2 and sin 60°= root 3/2

So angle A = 60°

Answer 2

answer:

Pythagoras

(A C) 2 = (BC)2 + (AB)2

(12)2 = (6)2 + (AB)2

144 = (36) + (AB)2