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Congruency Vocabulary See how much you already know… 1. Match the word, definition and example/symbol for each vocabulary term . 2. As the class reviews each definition, make corrections and glue in place. Plane Definition a perfectly flat surface that extends forever in all directions Example Parallel Lines Definition lines in a plane that never meet; they stay the same distance apart, like railroad tracks Example Symbol Coincidental Lines Definition The same line; existing at the same time and place. Example Skew Lines Definition Straight lines that are not in the same plane and do not intersect. Example Non-Example Perpendicular Lines Definition lines that intersect at a 90˚ angle Example Symbol Transversal Definition A line that intersects two or more lines that lie in the same plane. Transversals to parallel lines create angles with special properties. Example Right Angle Definition angle that measures 90˚ Example Symbol Acute Angle Definition greater than 0˚ and less than 90˚ Example Obtuse Angle Definition greater than 90˚ and less than 180˚ Example Complementary Angles Definition two angles that combine to make 90˚ Example Supplementary Angles Definition two angles that combine to make 180˚ Example Congruent Definition describes figures that have the same size and shape; angles that have the same measure are congruent Example 45 45 Symbol Vertical Angles Definition intersecting lines form two pairs of vertical (opposite) angles; vertical angles are always congruent to each other Example Corresponding Angles Definition angles formed by a transversal across parallel lines; these angles are congruent and have the same position relative to their parallel line and the transversal Example Alternate Exterior Angles Definition angles formed by a transversal across parallel lines; these angles are congruent and are on opposite sides of the transversal and are exterior to the parallel lines Example Alternate Interior Angles Definition angles formed by a transversal across parallel lines; these angles are congruent and are on opposite sides of the transversal and are interior to the parallel lines Example Consecutive Interior Angles • angles formed by a transversal across parallel lines; these angles are supplementary and are on the same side of the transversal and are interior to the parallel lines * *