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Geometry_Terms_6th
Plenty of geometry terms to study
| Term | Definition |
|---|---|
| acute angle | An angle with measure greater than 0 degrees and less than 90 degrees. |
| acute triangle | A triangle that has three acute angles |
| adjacent angles | Two angles that have the same vertex, share a common side, and do not overlap. |
| angle | Two rays with a common endpoint form an angle. The rays and vertex are used to name an angle. |
| arc | A portion of the circumference of a circle. |
| asymmetry | No symmetry |
| center of a circle | A point inside a circle that is an equal distance from all of the points on its circumference. |
| center of rotation | A fixed point around which shapes move in a circular motion to a new position. |
| central angle | An angle whose vertex is the center of a circle and whose sides intersect the circle. |
| chord | A segment with endpoints that are on a circle. |
| circle | The set of all points in a plane that are the same distance from a given point called the center. |
| complementary angles | Two angles are this if the sum of their measures is 90 degrees. |
| congruent | Line segments that have the same length, or angles that have the same measure, or figures that have the same size and shape. |
| corresponding angles | Angles that have the same position on two different parallel lines cut by a transversal. |
| diameter | The distance across a circle through its center. |
| equilateral triangle | A triangle with all sides congruent. |
| image | Every corresponding point on a figure after its transformation. |
| isosceles triangle | A triangle that has at least two congruent sides. |
| line | A never ending straight path. |
| line of reflection | The line that is reflected over in a reflection. |
| line of symmetry | Each half of a figure is a mirror image of the other half when this is drawn. |
| line segment | Part of a line containing two endpoints and all the points between them. |
| line symmetry | A figure has this if a line can separate the figure into two congruent parts. |
| obtuse angle | An angle with a measure greater than 90 degrees but less than 180. |
| obtuse triangle | A triangle with one obtuse angle. |
| parallel lines | Two lines in the same plane that do not intersect. |
| parallelogram | A quadrilateral with oppostie sides parallel and congruent. |
| perpendicular lines | Lines that intersect to form a right angle. |
| plane | A two-dimensional flat surface that extends in all directions and contain at least three noncollinear points. |
| point | An exact location in space that is represented by a dot. |
| polygon | A simple closed figure in a plane formend by three or more line segments. |
| radius | The distance from the center to any point on the circle. |
| ray | A part of a line that extends indefinitely in one direction. |
| rectangle | A parallelogram with four right angles. |
| reflection | A transformation where a fgure is flipped over a line. Also called a flip. |
| regualar polygon | A polygon having all sides congruent and all angles congruent. |
| rhombus | A parallelogram with four congruent sides. |
| right angle | An angle that measures 90 degrees. |
| right triangle | A triange with one right angle. |
| rotation | A transformation where a figure is turned around a fixed point. Also called a turn. |
| rotational symmetry | A figure has this if it can be turned less than 360 degrees about its and still look like the original. |
| scalene triangle | A triangle with no congruent sides. |
| sector | A pie-shaped part of a circle by the radius of a circle and an arc. |
| Side-Side-Side Rule | If all three sides in one triangle are the same length as the corresponding sides in the other, then the triangles are congruent. |
| skew lines | Two nonparallel lines in space that do not intersect. |
| square | A paralelogram with all sides congruent and four right angles. |
| straight angle | An angle with a measure equal to 180 degrees. |
| supplementary angles | Two angles are this if the sum of their measures is 180 degrees. |
| transformation | A movement of a geometric figure. |
| translation | A transformation where a figure is slid from one position to another without being turned. Also called a slide. |
| transversal | A line that intersects two parallel lines to form eight angles. |
| trapezoid | A quadrilateral with exactly one pair of parallel sides. |
| vertex | A point where two sides of the polygon intersect; where three or more planes intersect in a point; the common endpoint of the rays forming an angle. |
| vertical angles | Two pairs of opposite angles formed by two intersecting lines. The angles formed are congruent. |
Created by:
YungDaVinci
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