Answer: 235.5 ft³
Explanation:
 We are given the formula to use for this equation. We will substitute the given values and solve. However, first we must find the base.
Area of a circle:
 A = πr²
Substitute given values (r, the radius, is equal to half the diameter)
 A = (3.14)(2.5)²
Compute:
 A = 19.625 ft²
Given formula for volume:
 V = Bh
Substitute known values:
 V = (19.625 ft²)(12 ft)
 V = 235.5 ft³