Question

Trigonometry (urgent)
Find the measurement of angle A

Answer 1

Answer:53.78

Explanation:

a^2 = b^2 + c^2 - 2bc cos A

a=18

b=10

c=22

18^2= 10^2 + 22^2 - 2* 10 * 22 cos A

324= 584 - 440 cos A

-260=-440 cos A

cos A=53.78