congruent, Shapes that are the same size and the same shape., quadrilateral, A polygon with 4 sides and 4 angles., polygon, A flat, closed shape with three or more straight sides., acute angle, An angle that has a measure less than a right angle., obtuse angle, An angle with a measure greater than a right angle and less than a straight angle., right angle, What angle is created by perpendicular lines?, parallel lines, Lines in the same plane that never intersect and are always the same distance apart., intersecting lines, Lines that cross each other at exactly one point., perpendicular lines, Two lines that intersect to form four right angles.

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