Why is Math.Cos returning the wrong value?

Question

In my code:

Vector2 colCircle = new Vector2();

colCircle = new Vector2((R * Math.Sin(D)), -(R * Math.Cos(D)));

While:

R =          


        

Answer 1

Replace what you have with

colCircle = new Vector2((R * Math.Sin(D*Math.PI/180.0)), -(R * Math.Cos(D*Math.PI/180.0))); 

and you should be fine. Cos/Sin are expecting radians not degrees.

Answer 2

The trigonometric functions expect radians, not degrees.