A two-dimensional shape with three sides is a triangle. A three-dimensional shape with three faces is a cylinder.
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A shape with four sides has four vertices and a shape with three sides has three vertices, so a shape with four sides has more vertices than a shape with three sides.
Triangles have three straight sides.
It's called a "polygon".
An irregularly truncated hexagon.
A shape with three sides is called a triangle: 3 equal sides = equilateral 2 sides same length = isosceles 1 right angle = right-angled triangle