Question

Circumference of a circle whose diameter is 4cm

Answer 1

For this we can simply use the equation, circumference = pi * diameter

C = pi * 4

Circumference = 12.57cm

Answer 2

Circumference, C, of a circle is given = πd

Where d = diameter of the circle.

d = 4cm

C = πd

C = π*4

C = 4π

C ≈ 4*3.142

C ≈ 12.568 cm

The circumference of the circle is ≈ 12.568 cm

I hope this helps.