Question

Find the diameter and the

circumference of the circle
below: r= 8cm
8 cm
What is the circumference?

Answer 1

• diameter: 16 cm
• circumference: 16π cm ≈ 50.27 cm

Explanation:

The diameter is twice the radius:

d = 2r = 2(8 cm)

d = 16 cm

The diameter is 16 cm.

__

The circumference is pi times the diameter.

C = πd

C = π(16 cm)

C = 16π cm ≈ 50.27 cm

The circumference is 16π cm, about 50.27 cm.