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a surface such that if any two points on the surface are connected by a line, all points of the line are also on the surface
alternate interior angles
a pair of angles formed by 2 lines and a transversal. The angles must both lie in the interior of the figure, must like on alternate sides of the transversal, and must have different vertices (look for N or Z shape)
alternate exterior angles
a pair of angles formed by two lines and a transversal. The angles must both lie in the exterior of the figure, must lie on alternate sides of the transversal, and must have different vertices
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