Question

Using 3.14 as an approximation$\pi$How many cubic feet of concrete are needed to build the driveway? (Round to the nearest cubic foot)

Answer 1

1) Considering that that driveway has the shape of a semicircle, and that distance from point X to Y be its diameter, we can write:

Perimeter

$C_{\text{semicircumference}}=\frac{2\cdot\pi\cdot r}{2}=3.14\cdot5\text{ =15.7 }ft$

We can't forget that the question asks us the volume filled in by that asphalt into that semicircle. So let's calculate the Volume of that

$undefined$