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Directions: Cut out the definitions. Find the vocabulary term that matches each definition given. Use these definitions to complete your Vocabulary Worksheets. 1. The common endpoint of an angle. 2. An extra line or segment drawn in a figure to help complete a proof. 3. A transformation that moves all points of a figure the same distance in the same direction. 4. A mapping for which a geometric figure and its image are congruent. 5. A transformation that turns every point of a preimage through a specified angle and direction about a fixed point, called the center of ______ 6. Polygons in which all matching parts are congruent. 7. The angles of a triangle that are not adjacent to a given exterior angle. 8. Proofs that use figures in a coordinate plane and algebra to prove geometric concepts. 9. A transformation representing a flip of the figure of a point, line, or plane. 10. A statement that can be easily proved using a theorem is called a _______ of that theorem. 11. The side of a triangle that is a side of each of two angles. 12. Matching parts of congruent polygons. 13. In a triangle, the angle formed by two sides is the ________ _______ for those two sides. 14. An angle formed by one side of a triangle and the extension of another side. 15. A proof that organizes statements in logical order, starting with the given statements. Each statement is written in a box with the reason verifying the statement written below the box. Arrows are used to indicate the order of the statements. Directions: Cut out the definitions. Find the vocabulary term that matches each definition given. Use these definitions to complete your Vocabulary Worksheets.