Question

A concrete pillar has the shape of a cylinder. It has a diameter of 8 meters and a height of 9 meters. If concrete costs $87 per cubic meter, how much did the concrete cost for the pillar?

Answer 1

Cost, C = $28410.72

Explanation:

We have, a concrete pillar has the shape of a cylinder.

Diameter of pillar is 8 m and ts height is 9 m

If concrete costs $87 per cubic meter, it is required to find the concrete cost for the pillar. For this lets find the area of cylindrical shape. So,

`A=2\pi rh+2\pi r^2\\\\A=2* 3.14* 4* 9+2* 3.14* 4^2\\\\A=326.56\ m^2`

The cost of pillar at the rate of $87 per cubic meter will be :

`C=326.56* 87\\\\C=\$28410.72`