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Geometry Chap 9
Vocabulary
| Question | Answer |
|---|---|
| point | a position in space represented with a dot |
| endpoint | the end of a segment or ray |
| line | a set of points that extends without end in two opposite directions |
| ray | a part of a line that has one endpoint and extends without end in one directions |
| segment | a part of a line that consists of two endpoints and all the points between them |
| plane | a flat surface that extends without end in all directions |
| parallel lines | lines in the same plane that never meet |
| intersecting lines | lines in a plane that meet at a point |
| perimeter | the distance around a figure, measured in linear units such as feet, inches, or meters |
| area | the amount of surface covered by a figure - measured in square units such as sauare feet or square meters |
| ordered pair | two coordinates |
| coordinates | the numbers in an ordered pair that locate a point on a coordinate grid |
| coordinate grid | a coordinate plane |
| coordinate plane | a plane divided into four quadrants by a horizontal number line called the x-axis and a vertical line called the y-axis |
| angle | a figure formed by two rays with the same endpoint |
| vertex of an angle | the endpoint of the rays that form the angle |
| degrees | a unit used to measure angles, 180 degrees = the 3 angles in a triangle, 360 degrees = a circle |
| right angle | an angle whose measure is exactly 90 degrees |
| acute angle | an angle whose measure is less than 90 degrees |
| acute triangle | a triangle with three acute angles |
| obtuse angle | an angle whose measure is between 90 degrees and 180 degrees |
| obtuse triangle | a triangle with one obtuse angle |
| straight angle | an angle whose measure is exactly 180 degrees |
| vertical angle | when two lines intersect, the angles opposite each other are vertical angles |
| complimentary angles | two angles whose measures have a sum of 90 degrees |
| supplementary angles | two angles whose measures have a sum of 180 degrees |
| right triangle | a triangle with one right angle |
| equilateral triangle | a triangle with three sides of the same length |
| isosceles triangle | a triangle with at least two sides of the same length |
| scalene triangle | a triangle with three sides of different lengths |
| quadrilateral | a plane fiure formed by four segments called sides - each side intersectes exactly two other sides, one at each endpoint, and no two sides are part of the same line |
| parallelogram | a quadrilateral with two pairs of parallel sides |
| rectangle | a parallelogram with four right angles |
| rhombus | a parallelogram with four sides of equal length |
| square | a parallelogram with four right angles and four sides of equal length |
| polygon | a closed plane figure that is formed by three or more segments called sides - each side intersects exactly two other sides at a vertex |
| vertex of a polygon | a point at which two sides of a polygon meet |
| vertices | the plural of vertex |
| pentagon | a polygon with five sides |
| hexagon | a polygon with six sides |
| octagon | a polygon with eight sides |
| regular polygon | a polygon with equal side lengths and equal angle measures |
| diagonal | a segment, other than a side, that connects two vertices of a polygon |
| congruent figures | figures with the same size and shape |
| similar figures | figures with the same shape but not the same size |
| corresponding parts | the matching sides and angles of two figures |
| line symmetry | a figure has line symmetry if a line can be drawn that divides the figure into two congruent parts that are mirror images of each other |
| line of symmetry | the line that can be drawn that divides a figure into two congruent parts |
Created by:
mcmahanm