Why can circular objects roll with ease?

<p>When looking around ourselves, we notice numerous circular objects. The same thing about them is that they can roll without any significant restraint. The fact that those objects are round is applied in the manufacture of wheels for cars. Wheels were invented as early as the 4th millennium BC by the Sumerian people, and they retain their circular shape throughout the history of humanity. But why not make them more pointy as with triangles or squares?</p> <p>Before going straight to the answer, I want to talk about the shape of a circle. Specifically, why is a circle round? A circle is made up of an infinite set of points that arrange from the center with the same distance. In other words, the distance from the center to the edge of a circle is always the same (equal to the radius), unlike in triangles and squares.</p> <p><a href="https://medium.com/@binhho3042007/why-can-circular-objects-roll-with-ease-6e31b0bc8ee8"><strong>Website</strong></a></p>