The formula for the volume of a cone is V = 1/3 b × h... b is the area of the base of the cone. The base of the cone is a circle, so we have to use the area of a circle formula... A = pi × radius^2 So first let's find the area of the base... a = pi × radius^2 a = 3.14 × 12^2 (diameter is 24 so radius is 12) a = 3.14 × 144 a = 452.16 in^2 Now we can plug that into the volume of a cone formula... v = 1/3 b × h v = 1/3×452.16 in^2 × 10 in v = 150.72in^2 × 10 in V = 1507.2 in^3