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Find m PLEASE HELP 10 POINTS!!

Find m PLEASE HELP 10 POINTS!!-example-1
User RK Poddar
by
7.6k points

2 Answers

4 votes

Answer:

(D). 17 in.

Explanation:

c² = a² + b² - 2abcosC

cosC =
(a^2 + b^2 -c^2)/(2ab)

m∠C =
cos^(-1) (
(a^2 + b^2 -c^2)/(2ab) )

m∠C =
cos^(-1) (
(28^2 +18^2 -12^2 )/(2(28)(18)) )

m∠C =
cos^(-1) (
(964)/(1008) ) ≈ 17 in.

User Jluk
by
8.5k points
5 votes
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)
User Roman Royter
by
7.9k points

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