Question

Could you please help me out with a question . Exercise A.

Answer 1

For this exercise you need to remember that the circumference of a circle can be calculated with this formula:

`C=2\pi r`

Where "r" is the radius of the circle.

In this case, you know that the circumference of the circle is:

`C=21.2ft`

Then, you can substitute this value into the formula and solve for "r". This is:

`\begin{gathered} C=2\pi r \\ 21.2ft=2\pi r \\ \\ (21.2ft)/(2\pi)=r \\ \\ r\approx3.37ft \end{gathered}`

You can find the diameter by multiplying the radius by 2. Then, this is:

`\begin{gathered} d=(2)(3.37ft) \\ d\approx6.74ft \end{gathered}`

The answers are:

`\begin{gathered} d\approx6.74ft \\ r\approx3.37ft \end{gathered}`