condition to form a triangle
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Condition on the sides
The triangle inequality states that the sum of the lengths of any two sides of a triangle must be greater than or equal to the length of the third side. That sum can equal the length of the third side only in the case of a degenerate triangle, one with collinear vertices.
Edges and vertices: 3
Internal angle (degrees): 60°
Dual polygon: Self
Symmetry group: Dihedral (D3), order 2×3
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