Algodoo

In case you didn't know, those sizes that you show are the RADIUS of the circles (not the diameter).

To anyone wondering, the diameter of a circle/sphere is the distance between a point on the circle/sphere and the point on the opposite side of the circle/sphere -- for instance, you could measure Earth's diameter as the distance between the north pole and the south pole.*

The radius of a circle/sphere is the distance from any endpoint to the circle/sphere's center. You could measure Earth's radius as the distance between the north pole and the very center of Earth's core.

A rule of thumb: A circle/sphere's diameter is always exactly 2 times its radius!

*Earth is about one third of a percent wider at the equator thanks to its rotation and is also covered in mountains and valleys and is thus not a perfect sphere, but it is very close!