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# Set 1

### Math Vocabulary

Term | Definition |
---|---|

acute triangle | a triangle in which each of the three angles is acute (less than 90 degrees) |

additive pattern | a pattern that occurs when the same value is added to each input to determine the output or y = x + a |

area | the number of square units inside a closed 2D space |

congruent | of equal measure; having the same size and same shape |

decagon | polygon with ten sides and ten angles |

denominator | the part of a fraction below the bar that tells how many equal parts there are |

difference | the part remaining in subtraction |

equilateral triangle | a special isosceles triangle with three equal sides and 3 acute 60 degree angles |

heptagon | polygon with seven sides and seven angles |

hexagon | polygon with six sides and six angles |

inverse operations | opposite operations, or ones that undo each other such as addition and subtraction or multiplication and division |

isosceles triangle | a triangle with at least two congruent sides, with all acute, one obtuse, or one right angle |

multiplicative pattern | a pattern that occurs when the same value is multiplied by an input to determine the output or y = ax |

nonagon | polygon with nine sides and nine angles |

numerator | the part of a fraction above the bar that tells the number of fractional pieces being used |

obtuse triangle | a triangle that has one obtuse angle (greater than 90 degrees) and two acute angles |

octagon | polygon with eight sides and eight angles |

ordered pairs | a pair of numbers used to locate a point on a coordinate plane (x , y) |

parallel lines | lines in the same plane that do not cross each other; they stay the same distance apart |

parallelogram | a quadrilateral where opposite sides are parallel and congruent |

perimeter | a linear measurement around the outer edge of a figure |

pentagon | polygon with five sides and five angles |

perpendicular lines | lines that intersect at right angles to each other to form square corners |

polygon | a closed plane figure formed by three or more line segments (no curves) |

product | the total when two or more factors are multiplied |

quadrilateral | polygon with four sides and four angles |

rectangle | a quadrilateral that is a parallelogram and has four right angles |

regular polygon | polygon with all sides and all angles congruent |

rhombus | a quadrilateral that is a parallelogram and has four congruent sides |

right triangle | a triangle with one right angle (exactly 90 degrees) and two acute angles |

scalene triangle | a triangle with no congruent sides, with all acute, one obtuse, or one right angle |

square | a quadrilateral that is a parallelogram and has four right angles (rectangle) and four congruent sides (rhombus) |

sum | answer to addition |

trapezoid | a quadrilateral that only has one pair of parallel sides |

triangle | polygon with three sides and three angles |

x - coordinate | the first number in an ordered pair; it tells how far left or right to move from (0, 0) |

y - coordinate | the second number in an ordered pair; it tells how far up or down to move from (0, 0) |