139k views
5 votes
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

1 Answer

7 votes

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


r=(D)/(2)

so if we solve it will be:


\begin{gathered} r=(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}

User Lubor
by
7.0k points