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# geometry

Question | Answer |
---|---|

acute angle | an angle with a measure greater than 0 degrees and less than 90 degrees |

adjacent angles | angles that share an common ray and have the same origin |

angle | a geometric figure formed by two rays joined at their origins |

bisect | to divide into two equal parts |

bisector | a line or line segment that divides another figure into two equal parts |

collinear | lying on the same line |

complementary angles | two angles with measures that add up to 90 degrees |

congruent | having exactly the same size and shape |

coplanar | lying in the same plane |

degree | a unit of measure for angles; 1/360th of a circle |

empty set | a set having no elements; also called a null set |

infinite | without end; unable to be counted or measured |

interior angle | angle within a polygon; angle within two parallel lines that are crossed by a transversal |

line | in geometry, a set of connected points that extends infinitely in two directions |

line segment | a section of a line bounded by two endpoints |

midpoint | the point exactly in the center of a line segment |

null set | a set having no elements; also called empty set |

obtuse angle | an angle with a measure greater than 90 degrees and less than 180 degrees |

origin | the endpoint of a ray; on a coordinate grid, the point at the intersection of the axes, generally identified by the ordered pair ( 0, 0 ) |

parallel lines | lines in the same plane that do not intersect |

perpendicular lines | lines that form right angles when they intersect |

perpendicular bisector | a line or line segment that is perpendicular to another line segment through its midpoint |

pi | the Greek letter, which represents an irrational number with an approximate value of 22/7 or 3.14 |

plane | a flat, two dimensional surface that extends infinitely in all directions |

plane geometry | the study of figures that all lie in one plane |

point | a defined position in space that has no dimension; represented with a dot |

protractor | a device used to measure the number of degrees in an angle |

ray | a geometric figure that starts at a definite point (called the origin) and extends infinitely in one direction |

reflex angle | an angle that has a measure between 180 degrees and 360 degrees |

right angle | an angle measuring 90 degrees |

set | a collection of items |

straight angle | an angle with an measure of 180 degrees |

subset | a part of a given set |

supplementary angles | two angles with measures that add up to 180 degrees |

union | the combined elements from two or more sets |

vertex | the endpoint shared by two rays, line segments, or edges; plural is verticles |

vertical angles | the angles opposite each other when two lines intersect |

circle | a set of points an equal distance from the center |

radius | the distance from the center to the edge |

chord | intercepts the circle |

circumstance | the perimeter of circle |

oval/ellipse | a stretched circle |

diameter | measures through |

secant | where a line goes through at a couple points |

sector | a piece of the area of the circle |

edge | the lines where the faces of a rectangular solid meet |

cubed units | the volume of a geometric solid |

vertices | the edges of a rectangular solid meet in points called |

circle | the base of a cylinder is a |

face | the flat surface of an rectangular solid |

cylinder | geometric solid with a circular base and sides perpendicular to the base |

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