Flashcards: Geometry
About these flashcards
Created by:
Hillside5 on February 25, 2010
Subjects:
Groups:
Middle School, Tigers 8th, Tigers 9th, Tigers Seniors, Geometry
Log in to favorite or report as inappropriate.All 38 terms
Terms | Definitions |
|---|---|
 line | a straight path that goes in both directions forever |
| line segment | a straight path between 2 endpoints |
| ray | a straight path that has one endpoint and goes on in the other direction forever |
| angle | two rays sharing an endpoint |
| paralell | lines that never cross |
| intersecting | lines that cross or will cross; also called oblique |
| perpendicular | intersecting lines that form 90° angles |
| interior angle | angle on the inside |
| exterior angle | angle on the outside |
| acute angle | an angle less than 90° |
| right angle | 90° angle |
| obtuse angle | an angle greater than 90° and smaller than 180° |
| straight angle | 180° angle |
| reflex angle | an angle measuring greater than 180° but less than 360° |
| triangle | 3-sided closed figure |
| polygon | A figure having many angles |
| equilateral triangle | a triangle with equal sides and equal angles |
| isosceles triangle | a triangle with two equal sides |
| scalene triangle | a triangle with no two sides of equal length |
| right triangle | a triangle with one right angle |
| acute triangle | A triangle with three acute angles |
| obtuse triangle | a triangle with one obtuse angle |
| quadrilateral | a four-sided polygon |
| square | a quadrilateral with four right angles and four congruent sides |
| rectangle | A quadrilateral with 4 right angles |
| parallelogram | A quadrilateral with both pairs of opposite sides parallel |
| rhombus | a parallelogram with four equal sides |
| trapezoid | a quadrilateral with two parallel sides |
| protractor | a tool used to measure angles |
| vertical angles | pairs of opposite equal angles formed by intersecting lines |
| complementary | sum of angles that equals 90 degrees |
| supplementary | sum of angles that equals 180 degrees |
| congruent | Having the same size and shape |
| circle | The set of all points that are the same distance from a given point called the center; 360° |
| circumference | Distance around a circle |
| diameter | distance across a circle through the center |
| radius | the length of a line segment between the center and circumference of a circle |
| symmetry | having the same shape, size, and position on both sides of a dividing line |