Question

Find the length of side x using the law of Cosines Round your final answer to 4 decimal places.

Answer 1

The law of cosines that we can use to find the length of side x is:

`x^2=b^2+c^2-2bccos(\theta)`

Having in mind that we already know b and c and the angle theta:

`x=√(18^2+14^2-(2*18*14* cos(30)))=9.1391026`

Then the right answer is 9.1391.