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# Math Vocab

### Math

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

rectangle | a parallelogram w/ 4 right angles |

ray | a part of a line that starts at one endpoint and extends forever |

complementary angles | two angles whose measures add to 90 |

center of rotation | the point about which a figure is rotated |

congruent | having the same size and shape |

correspondence | the relationship between 2 or mre objects that are matched |

equilateral triangle | a triangle w/ 3 congruent sides |

image | a figure resulting from a transformation |

isosceles triangle | a triangle w/ at least 2 congruent sides |

line | a straight path that extends w/o end in opposite directions |

line of symmetry | the imaginary "mirror" in line symmetry |

line symmetry | a figure has line symmetry if one half is a mirror-image of the other half |

obtuse angle | an angle whose measure is greater than 90 but less than 180 |

obtuse triangle | a triangle containing one obtuse angle |

parallel lines | lines in a plane that do not intersect |

parallelogram | a quadrilateral w/ 2 pairs of parallel sides |

perpendicular lines | lines that intersect to form right angles |

plane | a flat surface that extends forever |

point | an exact location is space |

polygon | a closed plane figure formed by 3 or more line segments that intersect only at their endpoints (vertices) |

vertical angles | a pair of opposite congruent angles formed by intersecting lines |

rhombus | a parallelogram w/ all sides congruent |

right angle | an angle that measures 90 |

right triangle | a triangle containing a right angle |

rise | the vertical change when the slope of a line is expressed as the ratio rise over run |

rotation | a transformation in which a figure is turned around a point |

rotational symmetry | a figure has rotational symmetry if it can be rotated less than 360 around a central point and coincide w/ the original figure |

run | the horizontal change when the slope of a line is expressed as the ratio rise over run |

scalene triangle | a triangle w/ no congruent sides |

segment | a part of a line between 2 endpoints |

semiregular tessellation | a tessellation formed w/ 2 or more regular polygons in which every vertex is identical |

slope | a measure of the steepness of a line on a graph, the rise divided by the run |

square | a rectangle w/ 4 congruent sides |

supplementary angles | two angles whose measures have a sum of 180 |

tessellation | a repeating pattern of plane figures that completely cover a plane with no gaps or overlaps |

transformation | a change in size or position of a figure |

translation | a movement (slide) of a figure along a straight line |

transversal | a line that intersects two or more lines |

trapezoid | a quadrilateral w/ exactly one pair of parallel lines |

regular tessellation | a tessellation formed by using regular polygons |

regular polygon | a polygon w/ congruent sides and angles |

angle | a figure formed by 2 rays w/ a common endpoint called the vertex |

acute triangle | a triangle w/ angles measuring less than 90 |

acute angle | an angle that measures less than 90 |

reflection | a transformation of a figure that flips the figure across a line |

Triangle Sun Theorem | the theorem that states that the measures of the angles in a triangle add up to 180 |

Created by:
mdancer