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Congruent figures 2 objects with the same size and the same shape Congruent triangles Triangles that if their vertices can be matched up, then their corresponding parts are congruent Median Segment from the vertex to the midpoint of the opposite side Altitude Segment perpendicular to the line containing the opposite side Perpendicular Bisector Line, segment, or ray that is perpendicular to the segment and goes through the midpoint Line Perpendicular to a Plane They are perpendicular if and only if they intersect and the line is perpendicular to all lines in the plane that pass through that point of intersection