Differential Volume in Cylindrical Coordinates

For more figures related to the definition of coordinate systems, please have a look at the “coordinates” tag.

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\documentclass[border=3pt]{standalone}
\usepackage{tikz}  
\usepackage{tikz-3dplot} 
%Cylindrical Coordinate
\newcommand{\cylindricalcoordinate}[4]{%
\coordinate (#4) at ({#1*cos(#2)},{#1*sin(#2)},{#3});%
\coordinate (#4xy) at ({#1*cos(#2)},{#1*sin(#2)},0);%
}
\begin{document}
%Axis Angles
\tdplotsetmaincoords{70}{110}
%Macros
\pgfmathsetmacro{\rvec}{5}
\pgfmathsetmacro{\phivec}{45}
\pgfmathsetmacro{\zvec}{4}
\pgfmathsetmacro{\drvec}{1.5}
\pgfmathsetmacro{\dphivec}{20}
\pgfmathsetmacro{\dzvec}{1}
%Layers
\pgfdeclarelayer{background}
\pgfdeclarelayer{foreground}
\pgfsetlayers{background, main, foreground}
\begin{tikzpicture}[tdplot_main_coords]
%Coordinates
\coordinate (O) at (0,0,0);
%%
\cylindricalcoordinate{\rvec}{\phivec}{\zvec}{A}
\cylindricalcoordinate{\rvec}{\phivec}{(\zvec+\dzvec)}{B}
\cylindricalcoordinate{\rvec}{(\phivec+\dphivec)}{\zvec}{C}
\cylindricalcoordinate{\rvec}{(\phivec+\dphivec)}{(\zvec+\dzvec)}{D}
%%
 
 
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