Geometry Vocabulary
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Created by:
Lizard-Boy on February 9, 2011
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50 terms
Terms | Definitions |
|---|---|
 point | an exact location in space |
| line | a never ending straight path of points extending in both directions |
| plane | a two-dimensional flat surface that extends in all directions without end |
| line segment | part of a line with two endpoints |
| ray | a part of a line with one endpoint |
| angle | two rays that have a common endpoint |
| vertex | the common endpoint of an angle |
| protractor | tool used to measure angles |
| degrees | the most common measurement for angles |
| acute angle | angle measuring between 0 degrees and 90 degrees |
| right angle | angle measuring exactly 90 degrees |
| obtuse angle | an angle measuring between 90 degrees and 180 degrees |
| straight angle | an angle measuring exactly 180 degrees |
| parallel | two lines in a plane that never intersect |
| perpendicular | lines that intersect to form a right angle |
| skew | lines that are neither intersecting nor parallel - skew lines lie in different planes |
| vertical angles | two pairs of opposite angles formed by intersecting lines - vertical angles are congruent |
| adjacent angles | two angles with a common side, a common vertex, and do not overlap |
| congruent | the same |
| complementary angles | angles that sum to 90 degrees |
| supplementary angles | angles that sum to 180 |
| transversal | a line that intersects two parallel lines to form eight angles |
| alternate interior angles | angles on opposite sides of the transversal and inside the parallel lines -alternate interior angles are congruent |
| alternate exterior angles | angles on opposite sides of the transversal and outside the parallel lines -alternate exterior angles are congruent |
| corresponding angles | angles in the same position on the parallel lines in relation to the transversal - corresponding angles are congruent |
| acute triangle | a triangle with all acute angles |
| right triangle | a triangle with one right angle |
| obtuse triangle | a triangle with one obtuse angle |
| equilateral triangle | a triangle with all sides and angles congruent |
| isoscelese triangle | a triangle with two sides and two angles congruent |
| scalene triangle | a triangle with no sides or angles congruent |
| translation | slide a figure from one position to another position |
| reflection | flip a figure over a line |
| rotation | turn a figure around a fixed point |
| similar | polygons that have the same shape but not necessarily the same size |
| quadrilateral | 4 sided polygon |
| parallelogram | quadrilateral with opposite sides parallel and congruent |
| trapezoid | quadrilateral with one pair of parallel sides |
| rectangle | parallelogram with 4 right angles |
| square | parallelogram with 4 right angles and 4 congruent sides |
| rhombus | parallelogram with 4 congruent sides |
| polygon | a simple, closed figure formed by three or more line segments |
| regular polygon | a polygon with all angles and sides congruent |
| circle | the set of all points in a plane that are the same distance from a given point |
| radius | the distance from the center to any point on the circle |
| diameter | the distance across the circle through its center |
| symmetry | each half of a figure is a mirror image of the other half when a line is drawn |
| area | the measure of the surface enclosed by a geometric figure |
| perimeter | the distance around a polygon |
| circumference | the distance around a circle |
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