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# Math Review Gr. 6-8

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

Area | The measure (usually in square units) of the interior region of a two-dimensional figure |

Center of Rotation | A fixed point around which a geometric figure is rotated or turned. |

Circumference | The distance around a circle |

Circumference | Formula: 2 π r or π d |

Coefficient | A numerical factor in a term containing variables |

Coefficient | 3xy2 : 2 is an exponent; x and y are variables, 3 is a ______________________ |

Common factor | An integer that is a factor of two or more numbers |

Complementary angles | Any two angles such that the sum of their measures equals 90 degrees. |

Composite number | Any whole number with more than two factors |

Cone | A three-dimensional figure that consists of a circular face (the base), a point not in the plane of the base (the vertex), and a lateral surface that connects the vertex to each point on the boundary of the base |

Congruent figures | Two or more geometric figures that have the same size and shape |

Decagon | A polygon with 10 sides |

Diagonal | A line segment between non-consecutive vertices in a polygon |

Diameter | A cord that contains the center of a circle |

Equilateral triangle | A triangle with three congruent sides and three congruent angles;each angle measures 60º |

Equivalent | Equal in value |

Formula | An equation that shows the relationship between two or more quantities |

Greatest Common Factor | The greatest number that is a factor of two or more numbers |

Heptagon | A polygon with 7 sides |

Hexagon | A polygon with 6 sides |

Hypotenuse | In any right triangle, the side opposite the right angle |

Inequality | A mathematical sentence that compares two expressions that may or may not be equivalent; uses one of these symbols ≠, ≤, ≥, <, > |

Integer | The set of whole numbers and their opposites{… -3, -2, -1, 0, 1, 2 …} |

Irrational Number | A number that cannot be written as the ratio of two integers; when written as a decimal, the digits neither terminate nor repeat |

isosceles triangle | A triangle with at least two congruent sides |

Least Common Multiple | The smallest non-zero number that is a multiple of two or more numbers |

Mean | A measure of central tendency which is affected by all data points (with the possible exception of outliers); calculated by finding the sum of the data values and dividing by the number of data points |

Median | A measure of central tendency that occupies the middle position of a data set in ranked order |

Mode | A measure of central tendency that is the most frequently occurring value |

Measures of Central Tendency | Descriptive statistics that describe the center of the data set;mean, median and mode |

Nonagon | A polygon with 9 sides |

Natural Numbers | The counting numbers; the positive whole numbers; a positive integer |

Octagon | A polygon with 8 sides |

Odd Integer | Any integer that, when divided by 2, does not have an integer as the quotient |

Ordered pair | A pair of numbers used to locate a point in a coordinate plane; the pair is written in the form (x-coordinate, y-coordinate) |

Origin | In a coordinate plane, the point at the intersection of the x- and y-axes;the point (0, 0) |

Outcome | In a probability experiment, the result of an event |

Outlier | Any value in a set of data that is notably farther from the mean than the other data |

Parallelogram | Any quadrilateral with both pairs of opposite sides parallel |

Pentagon | A polygon with five sides |

Percent | Per one hundred; a special ratio in which the denominatoris always 100 |

Perfect Square | Any natural number that can be expressed as a natural number multiplied by itself such as 25 = 5 x 5 |

Perimeter | The distance around a geometric figure |

Perpendicular Lines | Two lines that intersect to form right angles |

Pi | The ratio of the circumference of a circle to its diameter; approximately 227; decimal approximation 3.14 |

Polygon | A simple, closed, plane figure with three or more sides that are line segments |

Polyhedron | A three-dimensional geometric figure with polygonal faces |

Prime Number | A natural number with exactly two factors (itself and one) |

Proportion | A statement of equality between ratios |

Pyramid | A polyhedron with a polygonal base, triangular faces and a vertex |

Pythagorean Theorem | A theorem defining the relationship between the lengths of the three sides of a right triangle;a2 + b2 = c2 where a and b are the lengths of the legs of the right triangle and c is the length of the hypotenuse |

Quadrilateral | A polygon with four sides |

Ratio | A comparison of any two quantities; may be expressed as a : b or a to b or ab |

Rational Numbers | The set of numbers that can be expressed as a ratio of two integers |

Reflection | A transformation in which all points under than transformation are mirrored over a line |

Rhombus | A parallelogram with four congruent sides |

Sample Space | The set of all possible outcomes of an experiment |

Scientific Notation | A standardized way of writing real numbersin the form a x (10 to a certain power) |

Similar | Having the same shape but not necessarily the same size |

Set | A group of numbers, variables, geometric figures or anything else |

Supplementary Angles | Two angles with measures adding to 180º |

Surface Area | The total area of the exterior of a three-Dimensional geometric figure; the lateral area added to the area of the base |

Terms | Parts of an expression separated by + or - signs |

Theoretical Probability | The ratio of the number of expected outcomes |

Transformation | Operations that alter the location or form of a figure |

Translation | A transformation in which a geometric figure Is moved to another location without changing its size (isometry) or orientation |

Trapezoid | A quadrilateral with exactly one pair of parallel sides |

Variable | A symbolic representation used to denote a quantity or expression; in mathematics, an “unknown” quantity that has the potential to change |

Vertical Angles | Angles formed by intersecting lines.These angles have a common vertex and are congruent. |

Volume | The total amount of space inside a three-dimensional object |

Whole numbers | Non-negative integers |

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