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Download LIST # 2: Geometry Vocabulary Words:
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LIST # 2: Geometry Vocabulary Words: APPROPRIATE FOR a) Academic Geometry b) Geometry c) Honors Geometry 1. Line segment: a measurable part of a line that consists of two points, called endpoints, and all of the points between them 2. Congruent: having the same measure 3. Theorem: a statement that can be proven to be true 4. Postulate: statement accepted as true without proof 5. Protractor: a device for measuring angles 6. Transversal: a line that intersects two or more lines at different points 7. Vertical Angles: two nonadjacent congruent angles formed by two intersecting lines 8. Complementary Angles: two angles whose measures have a sum of 90 9. Supplementary Angles: two angles whose measures have a sum of 180 10. Perpendicular Lines: lines that form right angles 11. Parallel Lines: coplanar lines that do not intersect 12. Similar Figures: figures whose corresponding angles are congruent but corresponding sides are in proportion 13. Reflection: a transformation representing a flip of the figure over a point, line or plane 14. Rotation: a transformation that turns every point of a reimage thru a specified angle and direction about a fixed point, called the center of rotation 15. Scale Factor: the ratios of the lengths of two corresponding sides of two similar polygons or two similar solids 16. Dilation: a transformation determined by a center point P and scale factor 17. Surface Area: the sum of the areas of all faces and side surfaces of a three dimensional figure 18. Circle: the locus of points in a plane equidistant from a given point called the center of the circle 19. Radius: any segment connecting the center of a circle/sphere to a point on the circle/sphere 20. Central Angle: an angle that intersects the circle at two points and has its vertex at the center of the circle 21. Pi: an irrational number represented by the ratio of the circumference of the circle and the diameter of the circle 22. Arc: a part of a circle that is defined by two endpoints 23. Chord: a segment whose endpoints are on the circle