Question

Which measurement of acute triangle ABC can you find by direct substitution of the labeled measures in the Law of Cosines?

Answer 1

cos A =(b^2 + c^2 - a^2) / (2 * b*c)
where side AB=c,BC=a,CA=b

Answer 2

http://cdn.ple.platoweb.com/PCAP-ASSETS-PROD/ff0f817e22da495db2d3434e578e1e14

Answer 3

I dont really know how to do this

Answer 4

never mind i got it. It was a. AC