Question

Find m angle A

A


10

B


20

C


16

D


14

Answer 1

D. 14°

Explanation:

The Law of Sines tells you sides are in proportion to the sine of the opposite angle:

sin(A)/BC = sin(B)/AC

sin(A) = BC/AC·sin(B)

A = arcsin(BC/AC·sin(B)) = arcsin(7/28·sin(75°)) ≈ 13.974° ≈ 14°