Question

Calculate the circumference of a circle with diameter 5 cm. Round to 2 d.p.

Answer 1

15.71 cm

Explanation:

Use the circumference formula, C = 2
`\pi`r

Since the radius of half of the diameter, the radius will be 2.5 cm

Plug in the radius into the formula and solve:

C = 2
`\pi`r

C = 2
`\pi`(2.5)

C = 15.71

So, the circumference of the circle is approximately 15.71 cm

Answer 2

15.71 cm

Explanation:

Equation for the circumference of a circle: 2πr or dπ where r is the radius & d is the diameter.

5*π = 15.71