In our primary education resources, we say that a circle has one curved side. However, it is also possible to challenge older children with the concept that a circle has an infinite amount of straight sides.

How many straight side does a circle have?

square has four sides and four corners, while a circle has only one side and no corners. that the Reuleaux triangle has three sides and three corners. As an exercise, the reader can compute the interior angle at each corner.

Are there sides in a circle?

If you think of the circle as a disk then it it has an up-side and a down-side. If you think of it as a curve, then it has an inside and an outside. If you think of it as the limit of an n-sided regular polygon, then one can justify the answer that the circle has infinitely many infinitesimal sides.