Area of a circular ring: A = 4[tex] \pi [/tex]pw
Solve for p. Find p when A = 22 cm^2 and w = 2 cm

Perimeter of a track: P = 2[tex] \pi [/tex]r + 2x
Solve for r. Finf r when P = 440 yrds and x = 110 yrds