Question

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

Answer 1

Answer:

15.71 cm

Step-by-step explanation:

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

5*π = 15.71

Answer 2

Answer:

15.71 cm

Step-by-step 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