# Diameter and Cubic Yards

• May 7th 2010, 08:49 AM
ambergarrett955
Diameter and Cubic Yards
I need help with this. I just need to be guided...I don't want the answer. Thank you

A 4 inch thick concrete slab is being poured for a circular patio 10 feet in diameter. Concrete costs $50 per cubic yard. Find the cost of the concrete. to the nearest cent. I know the diameter is going to be the distance across which is 10 ft, and then I am lost. • May 7th 2010, 09:55 AM masters Quote: Originally Posted by ambergarrett955 I need help with this. I just need to be guided...I don't want the answer. Thank you A 4 inch thick concrete slab is being poured for a circular patio 10 feet in diameter. Concrete costs$50 per cubic yard. Find the cost of the concrete. to the nearest cent.

I know the diameter is going to be the distance across which is 10 ft, and then I am lost.

Hi ambergarrett955,

The shape is a cylinder 4 inches high (1/9 yd).

The radius is 5 feet (5/3 yds).

You need to find the volume of this cylinder in cubic yards.

$\displaystyle V=\pi r^2h$

Once you've determined the volume, multiply it by 50 to
obtain the total cost.