Question

A circle has a diameter of 8cm calculate the circumfrence of the circle

Answer 1

Explanation:

The circumference of a circle is given by the formula C = πd, where d is the diameter of the circle and π is the mathematical constant pi, approximately equal to 3.14.

In this case, the diameter of the circle is 8 cm, so we can substitute this value into the formula to get:

C = πd

C = π(8 cm)

C = 25.12 cm

Therefore, the circumference of the circle is 25.12 cm (rounded to two decimal places).

Answer 2

C = 8π or ≈ 25.13cm

Explanation:

To solve for radius when given diameter:

Radius = diameter ÷ 2

Radius = 8 ÷ 2

Radius = 4

To solve for the circumference of a circle when given radius, we can use this equation:

• C = 2πr

Inserting 4 into the equation:

• C = 2π4

• C = 8π

• C ≈ 25.1327

Therefore, a circle with a diameter of 8cm has a circumference of 8π or 25.13cm (rounded to 2 decimal places).