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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