Here's a classic article from Nonki:

Small Basic: How to Use Trigonometric Functions

Let's imagine we want to draw an arc.

Assume the center of the arc is located at x = 200, y = 300, and the start angle is a1 = -30 and the end angle = -60.

In mathematics, the y axis goes up. But in Small Basic GraphicsWindow, the y axis goes down. So the sine of an angle becomes the opposite:

Here are the equations:

Read more and get the code here:

Small Basic: How to Use Trigonometric Functions

Big thanks to Nonki and his quality articles through the years!

Have a Small and Basic Thanksgiving (or a big stuffed one!)...

- Turkey Ninja Ed

Here are all Nonki's featured articles: blogs.msdn.com/.../featured+article

Special thanks Ed! You did a lot of grammar correction in this article. :->

Ha! Yes, I'll do a few sometimes. =^)