Volume of cone = (pi • r^2 • h)/3
If the diameter of the circle on the cone is 8 then the radius is 4.
V = (pi • 4^2 • 9)/3
V = 48pi in^3
Surface are of cone given radius.
= pi • r^2 + pi • r • square root of r^2 + h^2
A = 3.14 • 4^2 + 3.14 • 4 square root of 4^2 + 9^2
A = 16 • 3.14 + 4 square root of 97 • 3.14
A = 50.24 + 4 square root of 304.58
A = 50.24 + 69.81
A = 120.05
