The answer is The area of a circle provides the surface area of a cylinder’s base. Multiplying that by the height of the cylinder adds the third dimension of the solid
The area of the circle with radius r is:
A = r²π
The base of the cylinder is a circle with area A = r²π.
The volume (3rd dimension) of the cylinder with radius r and height h is:
V = r²πh
Multiplying the area of the circular base A = r²π by the height of the cylinder:
V = A*h
Therefore, the third choice is correct.