Question

Electric utility poles in the form of right cylinders are made out of wood that costs $19.32 per cubic foot. Calculate the cost of a utility pole with a diameter of 1 ft and a height of 20 ft. Round your answer to the nearest cent.

Answer 1

Radius = 1/2 ft. Volume = πr^2h = π(1/2)^2(20) = 5π ≈ 15.70796 ft^3.
Cost = 19.32 × 5π = 96.6π ≈ $303.48.

So the pole costs $303.48 (rounded to the nearest cent).