Given the following triangle, if c = 18.6 and m B = 43°, find the length of BC (side a) to the nearest whole number.

Let us assumed that we are given with a right triangle ABC and the other values were also given such as:

∠C = 90°

c = 18.6

∠B = 43°

BC = a

Solving for a, we can use SOH CAH TOA such as shown below:

cos B = a/c

cos 43° = a / 18.6

a = 13.6 unit

The answer for BC measurement is 13.6 units.