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# RISD 6 math vocab 2

### RISD 6th math vocabulary for 2nd 9 wks.

Math Vocabulary | Definition |
---|---|

simplify | to write a fraction or an expression in simplest form |

factor tree | a diagram showing the prime factorization of a number |

percent (%) | the ratio of a number to 100 |

proportion | a mathematical sentence stating that two ratios are equal |

rate | a ratio in which two quantities with different units of measure are compared |

ratio | a comparison of two quantities |

unit rate | the price for one unit of measure |

circle graph | a round graph that uses pie-shaped sections to show percents or parts of the whole |

congruent | having the same size and shape |

line symmetry | a figure has line summetry if a line can divide the figure into two congruent parts |

polygon | a closed figure made of line segments |

regular polygon | a polygon in which all sides are the same length and all angles have the same measure |

quadrilateral | a 4 sides polygon |

parallelogram | a quadrilateral with opposite sides parallel and congruent |

rhombus | a parallelogram whose four sides are congruent and whose opposite side angles are congruent |

line | a straight path that extends infinitely in opposite directions |

ray | a part of a line that has one endpoint and exends infinitely in the other direction |

line segment | a part of a line with two endpoints |

midpoint | the point on a line segment that divides it into two congruent parts |

parallel lines | two lines in the same plane that never intersect |

intersecting lines | two lines that cross at exactly the same point |

perpendicular lines | lines that intersect at one point and form right angles |

obtuse angle | an angle with a measure of more than 90 degrees but less than 180 degrees |

right angle | an angle with a measure of 90 degrees |

straight angle | an angle whose measure is 180 degrees |

acute angle | an angle that measures greater than 0 degrees and less than 90 degrees |

acute triangle | a triangle with 3 acute angles |

equilateral triangle | a triangle with 3 equal sides |

isosceles triangle | a triangle with 2 congruent sides |

obtuse triangle | a triangle with one obtuse angle |

right triangle | a triangle with one right angle |

scalene triangle | a triangle with no congruent sides |

circumference | the distance around a circle |

diameter | a line segment that passes through the center of a circle and has its endpoint on the circle |

radius | a line segment from the center of the circle to any point on the circle |

Pi | the ratio of the circumference of a circle to its diameter |

Created by:
sgrubb