Question

Find X.
Round to the nearest tenth.

Answer 1

Explanation:

`c^2=a^2+b^2-2ab\cos\theta\\ \\ \theta=\cos^(-1)(a^2+b^2-c^2)/(2ab)\\ \\ \theta=\cos^(-1)(55^2+50^2-90^2)/(2(55)50)\\ \\ \theta\approx117.9^o`