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# Math Vocab

### Math Chapter 9-10 Vocab

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

Square Root | a number n is a number m such that m2= n |

Perfect Square | a number that is the square of an integer |

Radical Expression | an expression that involves a radical sign |

Simplest form of a radical expression | a radical expression is in simplest form when (1) no factor of the expression under the radical sign is a perfect square other than 1, and (2) there are no fractions under the radical sign and no radical sign in the denominator of any fraction |

Hypotenuse | the side of a right triangle that is opposite the right angle |

Leg | the two sides of a right triangle that form the right angle |

Pythagorean Theorem | for any right triangle, the sum of the squares of the lengths a and b of the legs equals the square of the length c of the hypotenuse: a2 + b2= c2 |

Irrational number | a number that cannot be written as a quotient of two integers. The decimal form of an irrational number neither terminates nor repeats. |

Real number | the set of all rational numbers and irrational numbers |

Polygon | a closed plane figure who sides are segments that intersect only at their endpoints |

Pentagon | a 5-sided polygon |

Hexagon | a 6-sided polygon |

Heptagon | a 7-sided polygon |

Octagon | a 8-sided polygon |

Quadrilateral | a 4-sided polygon |

Trapezoid | a quadrilateral with exactly 1 pair of parallel sides |

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

Rhombus | a parallelogram with 4 congruent sides |