Question

Please answer this in two minutes

Answer 1

Answer:

$s = 14.1$

Step-by-step 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)