Question

If B=16º45' and c=13, then find a.

Answer 1

a = 12.4 units

Explanation:

We can use trigonometric ratio; Cosine

Cosine = Adjacent/ Hypotenuse

Cos B = a/c

But; c = 13 and a =?

B = 16° 45' = 16.75°

Therefore;

Cos 16.75 ° = a/13

a = 13 × cos 16.75°

= 12.4 units