In the formula V=a~b A(u)du used to compute the volume of a solid:
A.function A(u) represents the area of the intersection between a plane (perpendicular to an axis) and the solid.
B.the du can be thought of as representing the thickness of the axis of revolution.
C.the function A(u) represents cross-sectional area.
D.function A(u) represents the cross-sectional area and the du can be thought of as representing the thickness of the axis of revolution.

Question

In the formula  V=a~b A(u)du used to compute the volume of a solid: 
A.function A(u) represents the area of the intersection between a plane (perpendicular to an axis) and the solid.    
B.the du can be thought of as representing the thickness of the axis of revolution. 
C.the function A(u) represents cross-sectional area. 
D.function A(u) represents the cross-sectional area and the du can be thought of as representing the thickness of the axis of revolution.

anonymous · Answer

E.the function A(u) represents the cross-sectional area AND the the area of the intersection between a plane (perpendicular to an axis) and the solid.