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A ray. When there are no points, its a line. When it has two points, its a line segment.
Any three points anywhere in space can be the vertices of a triangle, as long as all three are not colinear.
If three sides of one triangle are congruent tothree sides of a second triangle, then the three triangles are congruent.
False. Three collinear points determine a line while three non-collinear points determine a plane ( A Triangle)
triangular prism