A. Circumference of Track 1 = 2π r
= 2 x 3.14 x 60
=376.8 feet
B.Circumeference of track2 = 2π r
= 2 x 3.14 x 85
=533.8 feet
C.Circumference of track3 = 2π r
=2 x 3.14 x 110
=690.8 feet
D.Circumference of the circular space = 2π r
Diameter was given to be 150 ft
but radius(r) is half the diameter. Hence radius = 150ft/2 = 75 ft
Circumference of the circular space = 2x 3.14 x 75
=471 feet