Question

Andy wants to build a circular concrete patio in his backyard and install a jungle gym on top of it. One 80-lb bag of concrete will be enough for 2 square feet. If he wants the diameter of the patio to be 10 ft, how many bags of concrete will he need to purchase?

Answer 1

Found it!

Answer 2

haha great!

Answer 3

One 80-lb of concrete is good for 2 sq ft
We need to find how many sq ft are in a 10-ft circle.

Answer 4

What is the formula for the area of a circle?

Answer 5

it wont say

Answer 6

A=πr2

Answer 7

Correct.

\(A = \pi r^2\)

\(\pi\) means pi and it's just a number.
r is the radius which is half of the diameter.
Our diameter is 10 ft.
What is our radius?

Answer 8

umm i dont think i know