Which of these conditions can create a triangle?

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.

Internal angle (degrees): 60°

Dual polygon: Self

Edges and vertices: 3

Explanation:

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