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# 7th/8th Math STAAR

### 7th & 8th Math STAAR Vocabulary

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

acute angle | An angle measuring more than zero degrees and less than 90 degrees |

area | Surface space that is measured in square units |

circumference | The distance around a circle (the perimeter of a circle) |

complementary angle | Two angles whose sum equals 90 degrees |

congruent | Having the same size and shape |

cylinder | A solid figure with two congruent and parallel circular bases |

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

difference | The amount that remains after one number has been subtracted from another |

dividend | In a division problem, it's the number being divided |

divisor | In a division problem, the number that an amount is divided by |

equation | A mathematical sentence that uses an equal sign |

equilateral triangle | A triangle that has three equal sides and three equal angles |

exponent | A number that tells how many times the base is multiplied by itself |

expression | A combination of numbers and variables connected by one or more operations signs |

hexagon | A polygon with six sides. |

isosceles triangle | A triangle with two equal sides and two equal angles |

lowest terms | A fraction with all common factors (other than 1) factored out of the numerator and denominator |

mean | The sum of a group of numbers divided by the number of numbers; also known as the average |

median | A value found by ordering a group of data from least to greatest and choosing the middle value of the group. |

mode | In a group of values, the value that occurs most often |

obtuse angle | An angle measuring more than 90 degrees and less than 180 degrees |

octagon | An eight-sided polygon |

order of operations | Rules that tell which steps to follow when solving an expression |

ordered pair | Two numbers listed in a specific order; it describes a point on the coordinate graph |

parallelogram | a quadrilateral with two pairs of congruent, parallel sides |

pentagon | A polygon with five sides |

percent | The ratio of a number to 100 (per one hundred); the symbol % |

perimeter | The distance around a figure |

polygon | Three or more line segments in a plane that forms a closed figure. The line segments never cross but meet at their endpoints. |

prism | a solid figure that has two congruent, parallel polygons as its bases. Its sides are parallelograms. |

product | The result of muliplying two or more numbers |

proportion | An equation stating that two ratios are equal |

pyramid | A solid figure that has triangles for its sides and a polygon as its base |

quadrant | One of the four regions formed by the intersection of the axes of a coordinate graph |

quadrilateral | A polygon that has four sides |

quotient | The result of dividing one number by another; the solution to a division problem |

radius | A length that is half the diameter of a circle; the distance from the center of the circle to the circle itself |

range | The difference between the least and greatest values in a set of numbers |

rate | A ratio that compares two different types of quantities |

ratio | A comparison of the two values of two numbers |

reciprocal | The inverse of a fraction; when multiplied by the original fraction, it results in a product that equals one |

rectangle | A parallelogram with four right angles |

reflection | A mirror image of a figure shown over a line of reflection |

rhombus | A parallelogram with all sides equal and congruent |

right triangle | A triangle with one right angle |

scale drawing | A drawing of an object that is different in size (usually smaller than the original) but keeps the same proportions |

scalene triangle | A triangle with sides of different lengths and no two angles are the same |

similar figures | Figures that have the same shape but different sizes; their sides are proportional, while their corresponding angles are equal |

simplify | To make a fraction easier to work with by taking out common factors |

square root | A number that when multiplied by itself results in the original number |

straight angle | An angle that measures 180 degrees |

sum | The total of two or more numbers being added |

supplementary angles | Two angles whose sum is 180 degrees |

trapezoid | A quadrilateral with one pair of parallel sides |

unit ratio | A ratio that shows the cost per unit of measure |

vertex (vertices - plural) | The point of intersection for two sides of a plane figure, three sides of a solid figure, or the endpoints of two rays that form an angle. |

x-axis | The horizontal number line of a coordinate graph |

x-coordinate | The value on the x-axis used to locate a point on the coordinate graph. It is the first value in an ordered pair. |

y-axis | The vertical number line of a coordinate graph |

y-coordinate | The value on the y-axis used to locate a point on the coordinate graph. It is the second value in an ordered pair. |