8R Geometry
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Created by:
CubanThreat on February 2, 2010
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Description:
Basic Geometry terms
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45 terms
Terms | Definitions |
|---|---|
 Alternate interior angles | Angles that lie within a pair of lines and on opposite side of a transversal. They are also congruent |
| Complementary angles | two or more angles whose sum is 90 degrees |
| corresponding angles | lie on the same side of the transversal and in corresponding positions |
| Adjacent angles | are a pair of angles with a common vertex and a common side, but no common interior points |
| line | A series of points that extends in two opposite directions without end. |
| Line segment | part of a line with two endpoints |
| parallel lines | lines in a plane that never intersect |
| perpendicular lines | Two lines that intersect to form right angles |
| point | a location that has no size |
| Supplementary angles | Two or more angles whose sum is 180 degrees |
| vertex | The common endpoint of an angle |
| Vertical angles | a pair of opposite congruent angles formed by intersecting lines |
| Ray | (mathematics) a straight line extending from a point |
| Right angle | an angle that measures 90 degrees |
| Acute angle | an angle that measures less than 90 degrees but more than 0 degrees |
| Obtuse angle | An angle that measures more than 90 degrees but less than 180 degrees |
| straight angle | an angle of 180 degrees |
| Congruent Angles | Angles that have the same measure |
| Congruent Sides | sides that have the same length. |
| Scalene Triangle | a triangle with no congruent sides |
| Isosceles Triangle | a triangle with two equal sides |
| Equilateral Triangle | a triangle with three congruent sides |
| Right Triangle | a triangle with one right angle |
| Acute Triangle | a triangle whose interior angles are all acute |
| Obtuse Triangle | a triangle that contains an obtuse interior angle |
| Quadrilateral | a four-sided polygon |
| pentagon | a five-sided polygon |
| hexagon | a six-sided polygon |
| octagon | an eight-sided polygon |
| nonagon | a nine-sided polygon |
| heptagon | a seven-sided polygon |
| decagon | a polygon with 10 sides and 10 angles |
| trapezoid | a quadrilateral with exactly one pair of parallel sides |
| paralleogram | a quadrilateral with two pairs of parallel sides. |
| Rhombus | a parallelogram with 4 congruent sides |
| rectangle | a parallelogram with four right angles |
| square | (geometry) a plane rectangle with four equal sides and four right angles |
| Congruent polygons | polygons with same size and shape |
| circle | ellipse in which the two axes are of equal length |
| radius | The distance from the center of a circle to a point on the circle |
| diameter | The distance across a circle through its center. The line segment that includes the center and whose endpoints lie on the circle. |
| central angle | An angle with a vertex at the center of a circle and whose sides are radii of the circle |
| chord | line segment whose endpoints are any two points on a circle |
| arc | part of a circle |
| semicircle | Half of a circle |
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