Question

Please answer this in two minutes

Answer 1

`s = 14.1`

Explanation:

Given:

<S = 31°

SQ = r = 9

SR = q = 21

s = ?

To find s, use the Law of Cosines:

s² = r² + q² - 2rs*cos(S)

`s^2 = 9^2 + 21^2 - 2*9*21*cos(31)`

`s^2 = 81 + 441 - 378*0.8572`

`s^2 = 522 - 324.02`

`s^2 = 197.98`

`s = 14.1` (nearest tenth)