#### If a regular polygon of ten sides is inscribed in a circle of radius *r *units, then, if *s *units is the length of the side,

#### Solve this formula for *s *in terms of *r*.

**SOLUTION:**

Multiply both sides by the LCD

Since we are solving for *s* in terms of *r*, we treat *r* as a constant. Thus, this is quadratic in *s* with the following:

Solve for s using the quadratic formula