Question

The circumference of the bike tire above is 82.896 inches. What is the radius of the bike tire? Use = 3.14.

Answer 1

The equation of the circumference with respect to the radius is:

C = 2(pi)*r

Thus to solve for r:
r=C/(2(pi))

r=82.896/(2*3.14)

r=13.2 inches

Answer 2

Circumference = 2 x radius x pie (3.14)

82.896 = 2 x 3.14 x r 
82.896 = 6.28 x r 
r = 82.896 / 6.28 
r = 13.2 

hoepfully this answer helps you