Question

Find the circumference of a circle with diameter,

d
= 7.18m.
Give your answer rounded to 2 DP.

Answer 1

Given:

Diameter of circle = 7.18 m

To find:

Circumference of the circle

Steps:

We know that radius is equal to half of the diameter

r = d/2

r = 7.18/2

r = 3.59 m

Now circumference is equal 2πr

Circumference = 2πr

Circumference = 2 × 3.14 × 3.59 (taking pi as 3.14)

Circumference = 6.28 × 3.59

Circumference = 22.5452

Circumference ≈ 22.55 meters

Therefore, the circumference of the circle is approximately 22.55 meters

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Answer 2

C = 22.56

Explanation:

The equation for the circumference of a circle is
`C=2\pi r`.

The radius is half the diameter so
`r=(7.18)/(2)=3.59`

Plug the radius into the equation.

`C=2*\pi *3.59`

`C=22.55664`