Question

Your town is building a circular ice rink with a diameter of 100 feet. Around the ice rink will be a walkway that is 10 feet wide. What is the approximate area of the walkway?

Answer 1

one way is
area of total=walkway+rink

walkway=area of total-rink

area=pir^2

diameter=2r
d/2=r
rink is diameter 100
d=100
100/2=50=r
area=pi50^2
area=pi2500


area of rink
diameer=100+10+10 (because the walkway is on both sides)
120/2=60
area=pi60^2
area=360pi


total-rink=250pi-360pi=110pi
if aprox pi=3.14 then
area=345.4 ft^2