The area of the element is given by rdrdθ
This is a graph that shows a small area element defined in polar coordinates
The limits for the graph are from 0.0 to 1.0 in the radial direction and though angles 0 to 2π Yet again the origin of the graph can be found at the centre of the graph.
The area of the element is given by rdrdθ
Annotated onto the graph are the lengths r, dr and arclength rdθ. As well as two angles θ and dθ. The area highlighted by the light transparent red color is the element area of size rdrdθ.
The position and size of the element can be altered by clicking on and dragging the various sliders present at the bottom of the applet. If you choose values too small then the labeling may start to overlap and become hard to discern.
Some sliders, which can slide!