# I am installing a 1 yard-wide walk around circular swimming pool that is 21 ft in diameter. What is the area of the walk?

Dec 3, 2015

Adding a 1-yard walkway increases the circle to $21 + 3 + 3 = 27$ feet in diameter
Area of big circle minus small circle $= \pi \left({\left(\frac{27}{2}\right)}^{2} - {\left(\frac{21}{2}\right)}^{2}\right)$
= Area of walkway $= 72 \pi \approx 226.2$ sq ft