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# 8th grade math

### math 3rd 9weeks vocab

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

Scientific notation | a way of expressing a number as a product in the form n *10a, where a is an integer and n is a decimal number such that 1< n <10 |

Cube root of x | the number that when cubed is equal to x |

Perfect cube | the product when an integer is used as a factor three times |

Perfect square | the product of an integer and itself |

Square root of x | the number that when multiplied by itself is equal to x |

Irrational number | a number that cannot be expressed as a quotient of two integers. The decimal expansion of an irrational number never repeats itself or terminates. |

Real numbers | the set of rational and irrational numbers |

Converse of the Pythagorean theorem | in a triangle, if the square of the length of the longest side is equal to the sum of the square of the lengths of the other two sides, then the triangle is a right triangle. |

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

Legs (of a right triangle) | the two sides of a right triangle that form the right triangle |

Pythagorean theorem | in any right triangle, the sum of the squares of the lengths of the legs, a and b, is equal to the square of the length of the hypotenuse, c. So a2+b2=c2 |

Cone | a three-dimensional figure with one circular base and one vertex, connected by a curved surface. |

Sphere | a three-dimensional figure in which every point is the same distance from the center |