A shape with three sides is called a triangle:
3 equal sides = equilateral
2 sides same length = isosceles
1 right angle = right-angled triangle
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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.
A two-dimensional shape with three sides is a triangle. A three-dimensional shape with three faces is a cylinder.
a triangle anything with 3 sides is a triangle
Triangles have three straight sides.
well if you take octagon (8 sides) , in 3d shapes octagon is probably called octagonal prism. and the sides are actually called faces. AND a 7 sided shape , a heptagon, is called heptagonal prism