No, they cannot be. If they were, they would form a straight line, not a triangle!
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The three segments that connect three non-collinear points form a triangle. Each segment connects one point to another, resulting in three sides of the triangle. The points are the vertices of the triangle, and since they are non-collinear, they create a closed shape with distinct interior and exterior regions.
A triangle with no angles is called a degenerate triangle. It occurs when the three vertices are collinear, meaning they all lie on the same straight line. In a degenerate triangle, the side lengths sum up to zero.
The vertices of a triangle are the endpoints. In other words, when the sides of the triangle intersect, they form a vertex of a triangle. A triangle has a total of three vertices.
A triangle has 3 vertices.
A triangle has 3 vertices and 3 sides