Question

Find m PLEASE HELP 10 POINTS!!

Answer 1

Use the cos rule

cos^-1(18^2+28^2-12^2 divided by 2*18*28

Which is 16.99 degrees, which is 17 (option d)

Answer 2

Answer:

(D). 17 in.

Step-by-step explanation:

c² = a² + b² - 2abcosC

cosC = $\frac{a^2 + b^2 -c^2}{2ab}$

m∠C = $cos^{-1}$ ( $\frac{a^2 + b^2 -c^2}{2ab}$ )

m∠C = $cos^{-1}$ ( $\frac{28^2 +18^2 -12^2 }{2(28)(18)}$ )

m∠C = $cos^{-1}$ ( $\frac{964}{1008}$ ) ≈ 17 in.