help part 1

Here you go:

 ∠ R = α = 28.072° = 28°4'21″ = 0.49 rad

This is a trigonometry problem. We have to use inverse oprations.

We can use any of the sine, cosine, tangent, cotangent, secant, and cosecant since we know all of the 3 sides.

Let's just say we use sine. 

It is basically the ratio of the side opposite to the angle to the hypotenuse.

In this case, it is 8 : 17. 

The inverse of sine of 8/17 is 49 rad or about 28 degrees.

I hope this helps. 

A small typo in radians. It should read 0.49 radians.