Question

To find the distance around a circular disc, multiply the diameter of the disc by 3.14. What is the distance around the disc when the radius is 6.45 cm?

Answer 1

Given, 

Distance around a circular disc = Diameter of disc × 3.14

Radius of disc = 6.45 cm

Diameter of disc = 2 × Radius of disc = 2 × 6.45 = 12.9 cm

Distance around a circular disc = 12.9 × 3.14 = 40.506 cm