Question

Given the triangle below, what is the length of the third side, rounded to the nearest whole number?

Answer 1

Explanation:

You need the Law of Cosines for this, namely:

`x^2=21^2+14^2-2(21)(14)cos58` where x is the missing side.

`x^2=441+196-311.5925` and

`x^2=325.4075` so

x = 18.0 or just 18