Respuesta :
area=pir^2
d/2=r
all-rink=walkway
all diameter=100+10+10 (because 2 sides of the rink)
all radius=120/2=60
area =pir^2
area=pi60^2
area=3600pi
rink diameter=100
rink radius=100/2=50
area=pi50^2
area=2500pi
walkway=all-rink
walkway=3600pi-2500pi
walkway=1100pi
if aprox pi=3.14
walkway=3454 ft^2