Question

Determine the measure of the largest angle in a triangle with sides of 12, 9, and 4​

Answer 1

130.8

Explanation:

Use law of cosine

12^2=9^2+4^2-2*9*4cos

144=97-72cos

47=-72cos

(Use cosine inverse now)

Cos-1(47/-72)

Largest angle is 130.8 when rounded to the nearest then the