If p,q,r are sides, then p is not an angle. Maybe you meant P.
So use the law of cosines.
p^2 = q^2 + r^2 - 2qr cosP
15^2 = 19^2 + 22^2 - 2*19*22 cosP
cosP = 155/209
P = 42.13°
The angle p, to the nearest degree, in a triangle with side lengths p=15cm, q=19cm and r=22cm, is?
I missed a class to get corona tested and my teacher says its my fault that I don't know how to do this. My friend tried to explain it to me but Im not sure he understands it either. Help!
1 answer