Turning up the radius slider increases the size of the circle while turning it down decreases the size of the circle. Turning up the pen accuracy decreases the level of precision of the circle drawing while turning it down increases the precision. The diameter, circumference, and area of the drawn circle is shown on the bottom left & right corners. The measurements are in units. Happy Pi Day!!
Warning: Setting the pen accuracy to a number lower than 1 will take very long to draw the circle, as it is very precise. Turning Turbo Mode on is recommended. (Shift + Click on the green flag to do so.) Credits: @nborno for inspiring me to create this project.