Calculate the circumference of a circle that has

(a) a radius of 7 cm.

(b) a radius of 56 cm.

(o) a diameter of 9.2 cm.

(d) a diameter of 98 mm.

The answers are a) 43.96 cm, b) 351.68 cm, c) 28.8 cm and d) 307.72 mm

The formula to calculate the circumference of a circle is C = π d, or C = π 2r, where d is the diameter and r is radius.

A - C=3.14 x 2 x 7 = 43.96 cm

B - C=3.14 x 2 x 56 = 351.68 cm

C - C=3.14 x 9.2 = 28.8 cm

D - C=3.14 x 98 = 307.72 mm