Question

Work out the circumference of this circle.

Take to be 3.142 and write down all the digits given by your calculator,
13 cm

Answer 1

given:

diameter= 13 cm

to find:

the circumference of the given circle.

solution:

`c = \pi \: d`

`c = 3.142 * \: d`

`c = 3.142 * 13`

`c = 40.846 \: cm`

hence, the circumference of the given circle is 40.846 cm

Answer 2

Given:

• d= 13 cm

Note that:

• d: diameter

To find:

• The circumference of the given circle.

Solution:

First, we'll have to change the diameter to radius by dividing the diameter by 2.

`\large\boxed{Formula: r= (d)/(2)}`

So we'll have to divide 13 by 2.

Substitute the values according to the formula.

`r= (13)/(2)`

`\bold{6.5 \: cm}`

Now, we can find the circumference.

`\large\boxed{C= 2\pi{r}}`

Substitute the values according to the formula.

`C= 2*\pi*6.5`

Calculate value:

`\large\boxed{C= 40.8407045 \: cm}`

Therefore, the circumference of the given circle is 40.8407045 centimeters.