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3.
A triangle can't be a square. A triangle only has 3 points, squares have 4.
A triangle? Three lines that intersect in three points.
No, A plane can be drawn through any 3 points. If the 3 points are collinear then they make a line and a plane can contain a line. If the points are noncollinear then they can be used to form the corners of a triangle; all points of a triangle are in the same plane.
A triangle is joined together by 3 vertices which is the plural of vertex