Question

Find the value of

x in the triangle shown below.

Answer 1

69.7° (corrected to 3 significant figures)

Explanation:

Use the cosine formula to solve for x.

`cosA=((b^2+c^2-a^2))/(2bc) \\cos x =(3.5^2+ 3.5^2 -4^2)}/[2(3.5)(3.5)]cos x =0.346939\\x=69.7`