Question

22 Find the circumference of the circle, Use 3.14 or for x. Round to the nearest tenth if necessary, 31.5 cm

Answer 1

To find the circumference of a circle with a radius of 31.5 cm, use the formula 2πr and multiply 2 × 3.14 × 31.5 cm to get approximately 197.8 cm.

Step-by-step explanation:

The circumference of a circle is given by the formula 2πr, where π (pi) is approximately 3.14 and r is the radius of the circle. Given that the radius of the circle is 31.5 cm, we can substitute into the formula to find the circumference. Therefore, the circumference C will be 2 × 3.14 × 31.5 cm.

Calculating this gives us:

C = 2 × 3.14 × 31.5 cm

C = 6.28 × 31.5 cm

C = 197.82 cm

If we round to the nearest tenth, the circumference is approximately 197.8 cm.

Answer 2

The circumference is 198 cm

STEP-BY-STEP EXPLANATION:

We have the formula to calculate the circumference of the circle is the following:

`c=2\pi r`

we replace the value of pi and the radius:

`\begin{gathered} c=2\cdot(22)/(7)\cdot31.5 \\ c=198 \end{gathered}`