# Circle Area with a Parallelogram

I made this way back in middle school in Adobe Flash CS4. (This
was before Adobe changed the name.) It is a Windows executable
that animates sectors of a circle being rearranged into a
pseudo-parallelogram. This helps you visualize why the formula
for the area of a circle works.

I also had a website in middle school. It was a different
website than this one. The text below was taken from an archive
of my old website.

## Text from My Old Website

The Circle Area Visualizer dynamically visualizes the area
formula of a circle. The user drags the center and a point to
form a circle, which is automatically sliced into the given
number of sectors. By dragging the sliders at the bottom or
using the animation buttons, the user can rearrange the sectors
into a pseudo-parallelogram, from which the area formula of a
circle is derived. Below is the algebra behind the area formula
of a circle, based on the parallelogram attained with the
method that Circle Area Visualizer illustrates.

The current version of the Circle Area Visualizer is 1.2.
Download the Windows executable!

Note: The screenshots below were taken with Version 1.1 of the
program.