A tetrahedron is made up of four equal sided triangular sides (a pyramid has four triangular sides and a square base, but that's probably not what you were looking for). The triangle itself always has exactly three sides.
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All triangles only have three sides. You might be thinking of a pyramid. A pyramid has 3 triangular sides, and a square side.
A triangle, by definition, can have only three sides. So a four sided triangle simply cannot exist!A triangle, by definition, can have only three sides. So a four sided triangle simply cannot exist!A triangle, by definition, can have only three sides. So a four sided triangle simply cannot exist!A triangle, by definition, can have only three sides. So a four sided triangle simply cannot exist!
A three-sided, two-dimensional polygon is called a "triangle".
it is called a triangle
It is called a triangle
A 3-sided figure is called a triangle.