Geometry 3rd Quarter
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Created by:
lib_aca_jmo on January 18, 2011
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46 terms
Terms | Definitions |
|---|---|
 ray | A never ending straight path that goes in one direction |
| plane | a set of all points on a flat surface extending in all directions |
| segment | Part of a line between to endpoints |
| line | a never ending straight path that goes in both directions |
| perpendicular lines | Two lines that intersect to form right angles |
| intersecting lines | lines that cross at one point |
| parallel lines | lines in the same plane that never intersect |
| intersecting planes | planes that meet at a line |
| parallel planes | planes that do not intersect |
| perpendicular planes | planes that intersect at a right angle |
| right angle | an angle that measures exactly 90 degrees |
| straight angle | an angle measuring 180 degrees |
| acute angle | An angle less than 90 degrees |
| obtuse angle | an angle that measures more than 90 degrees but less than 180 degrees |
| vertex | The common endpoint of an angle |
| congruent | Having the same size |
| polygon | a closed plane figure formed by three or more line segments |
| trapezoid | exactly 1 pair of parallel sides |
| parallelogram | opposite sides are congruent and parallel |
| rectangle | a parallelogram with 4 right angles |
| rhombus | a parallelogram with 4 congruent sides |
| square | a parallelogram with 4 right angles and 4 congruent sides |
| supplementary angles | Two angles whose sum is 180 degrees |
| complimentary angles | Two angles that add up to 90 degrees |
| isosceles triangle | a triangle with two congruent sides |
| obtuse triangle | a triangle with 1 obtuse angle |
| equilateral triangle | A triangle with 3 congruent sides and 3 congruent angles |
| scalene triangle | a triangle with no congruent sides |
| right triangle | a triangle with one 90 degree angle |
| acute triangle | A triangle with three angles less than 90 degrees. |
| 180 degrees | The sum of the angles of a triangle |
| 360 degrees | Number of degrees in a circle and in quadrilaterals |
| quadrilaterals | a polygon with four sides |
| pentagon | a five-sided polygon |
| hexagon | a polygon with 6 sides |
| octagon | A polygon with 8 sides |
| diameter | the distance across a circle through its center |
| radius | The distance from the center of a circle to a point on the circle |
| point | a single location or position |
| regular polygon | a polygon with all sides and all angles equal |
| translation | A transformation that "slides" each point of a figure the same distance in the same direction. |
| reflection | A transformation that "flips" a figure or mirror image. |
| rotation | Turning around an axis or center point. |
| dilation | A transformation that changes the size of an object, but not the shape. |
| scale factor | the ratio used to enlarge or reduce similar figures |
| similar figures | figures that have the same shape but not necessarily the same size |
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