Question

a trampoline has a diameter of 21 ft. what is the areaUse the approximate value of 3.14 for The area of the trampoline is approximately

Answer 1

We have a trampoline with 21ft of diameter so we can calculate the radius like:

$r=\frac{D}{2}$

so if we solve it will be:

$\begin{gathered} r=\frac{21}{2} \\ r=10.5 \end{gathered}$

Now we can use the formula for the area of a circle that is:

$A=\pi r^2$

so:

$\begin{gathered} A=3.14\cdot(10.5)^2 \\ A=346.185 \end{gathered}$