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# SAT Prep Vocab

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

Supplementary Angles | 2 angles whos sum is 180 |

Chord | segments whos endpoints are in a circle |

Area of a circle | pir^2 |

Circumference of a circle | 2pir |

Slope formula | (y2-y1)/(x2-x1) = rise/run |

Midpoint formula | (x1+x2/2 , y1+y2/2) |

Distance formula | d= the sqrt((x2-x1)^2+(y2-y2)^2) |

Equation of a circle | (x-h)^2+(y-k)^2=r^2 Center of the circle is (h,k) |

Equation of an Ellipse | (x-h)^2+(y-k)^2=1 |

Remember for sin, cos, and tan | SOHCAHTOA |

Secant | 1/cos |

Cotangent | 1/tan |

Remember sin and cos | sin^2 the angle + cos^2 the angle=1 |

Percent increase/decrease | change in the amount/original amount x 100 |

Difference of squares formula (FOIL) | a2 – b2 = (a + b)(a – b) or (a – b)(a + b) |

Systems of equations | Substitute |

is, has, was, will, be | = |

more, total increases by, exceeds, gains | + |

less, decreased, lost, fewer, difference | - |

of, product, each | x |

Rates | distance= rate x time |

vertex | h= |

Range | difference between the smallest and the largest number |

Mean | the average -add them up and divide by the total added |

Median | the middle value in a set of numbers |

Mode | the number that repeats the most in a set of numbers |

Probability | desired outcomes/total outcomes |

Domain | x |

Range | y |