a triangle
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They are polygons and they have 3 or more sides
A shape with three sides is called a triangle. A shape with ten sides is called a decagon.
No. All 2-dimensional shpaes with 8 sides are octagons; all 3-dimensional shapes with 8 sides are called octahedrons.
Shapes with straight sides are called polygons
Polygons are shapes with 3 or more sides