Question

Enter the number that belongs in the green box

Answer 1

45.57

Explanation:

Apply the Law of Cosines to get
`5^2+2^2-2*5*cosA=6^2`, where A is the desired angle. Eliminating terms, we see that
`10cosA=7, cosA=7/10`. Taking inverse functions, we get A=
`arccos(10/7)` for approximately 45.57 degrees.