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# 2012-8thMathPTVocab2

### South Habersham Middle School 8th Grade Math Powertime Vocabulary Unit 2

Word | Definition |
---|---|

Multiplicative Inverses | Two numbers that when multiplied together equal 1, for example, 4 and ¼. |

Perfect Square | A number that has a rational number as its square root. |

Radical | A symbol that is used to indicate square roots. |

Rational | A number that can be written as the ratio of two integers with a nonzero denominator. |

Scientific Notation | A representation of real numbers as the product of a number between 1 and 10 and a power of 10, used primarily for very large or very small numbers. |

Square Root | One of two equal factors of a nonnegative number. For example, 5 is a square root of 25 because 5 • 5 = 25. Another square root of 25 is -5 because (-5) • (-5) = 25. The +5 is called the principle square root. |

Variable | A letter or symbol used to represent a number. |

Altitude of a Triangle | The perpendicular distance between a vertex of a triangle and the side opposite that vertex. Sometimes called the height of a triangle. Also, sometimes the line segment itself is referred to as this term. |

Base (of a Polygon) | Any side in a two-dimensional figure. Typically, however, it is the bottom side, on which the polygon "sits." |

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hbogue