Triangle
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A shape with 3 horizontal sides is a triangle. A triangle is a polygon with three sides and three angles. In a triangle, one of the sides will be the base, and the other two sides will be the legs. The angles opposite the legs are called the base angles.
triangle
There is no shape that is made up 3 sides that is not a triangle. Any shape that is made up of 3 sides is classified as a triangle no matter what shape or size it is.
A triangle has 3 sides
A shape with three sides is called a triangle.
Assuming that each vertex is used to connect exactly two sides, all two-dimensional shapes will have the same number of sides as vertices. So a shape with 4 sides will have 4 vertices and a shape with 3 sides will have 3 vertices. Think of a square (4 sides, 4 vertices) and a triangle (3 sides, 3 vertices).