What shape has fewer than 4 sides?

Answer 1

a triangle has 3 sides, and a circle has 1

Answer 2

Well, honey, a circle is the shape you're looking for. It's got zero sides, but don't underestimate it just because it's a round little fella. It may not play by the rules of those square and triangle folks, but it's still a valid shape in my book.

Answer 3

triangle