Chapter 2 - Solving Equations - 2-5 Literal Equations and Formulas - Practice and Problem-Solving Exercises - Page 112: 28

r$\approx$3.5 m

Use the Circumference formula C=2$\pi$r to solve for the radius represented by r. Since we are given that the circumference is 22, plug 22 in for C giving you: 22=2$\pi$r Divide both sides by 2$\pi$; remember that $\pi$$\approx$3.14. This leaves us with the answer r$\approx$3.5.