Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

Normal Size Small Size show me how

Normal Size Small Size show me how

# 7MA_Formulas

### Math Formulas

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

Perimeter of a Rectangle | P = 2l + 2w or P = 2(l + w) |

Perimeter of a Polygon | Sum of all sides |

Circumference of a Circle | C = 2πr or C = πd |

Area of a Triangle | A = 1/2bh or A = bh/2 |

Area of a Circle | A = πr to the 2nd power |

Area of a Square | A = s to the 2nd power |

Area of a Rectangle | A = lw or A = bh |

Area of Parallelogram | Base x height |

Area of a Trapezoid | A = 1/2(a+b)h |

Volume of a cylinder | V = πr to the 2nd power times h |

Surface Area of a Cylinder | S = 2πrh + 2πr to the 2nd power or S = 2πr(h + r) |

Volume of a rectangular prism | V = (L)(W)(H) |

Surface Area of a Rectangular Prism | 2(LW + LH + WH) |

Percent Change | Difference divided by Decimal (difference/original $ = percent change) |

Simple Interest | Interest = percent x rate x time I= ($) x (%) x (years) |

Ratio for probability | Desire divided by total |

Rational Numbers | numbers that can be written as a ratio or fraction ("all frats are rats") |

Irrational Numbers | Cannot be written as a ratio or a fraction (no bar, no pattern) Example: π - Pi |

Scientific Notation | a way to easily handle very large numbers or very small numbers (ex: 0.0000000056 = 5.6 x 10 to the -9 power) |

Midpoint Value | x1 + x2/2, y1 + y2/2 (subscript↓) |

Complementary Angles | either of two angles whose sum is 90 degrees |

Supplementary Angles | either of 2 angles whose sum is 180 degrees |

Translation | slide |

rotation | turn |

dilation | multiply/enlarge/shrink |

reflection | flip |

distance/rate formula | d = r x t |

distance between two points | d=√(x2-x1)2 + (y2-y1)2 (subscript↓) |

unit cost | total cost/# of items or money/number |

Slope intercept form | y=mx + b |

slope formula | rise/run or y2-y1/x2-x1 (subscript↓) |

Triangle sum theorum | a + b + c = 180 |

Exterior angle theorum | angle A = the sum of 2 remote interior angles of a triangle |

Pythagorean Theorum | a2 + b2 = c2 (superscript↑) |

Volume of a cube | v = s3 (superscript) or V = L x W x H |

Volume of a cone | v = 1/3πr2h (superscript↑) |

volume of a sphere | v = 4/3πr3 (superscript↑) |

volume of a pyramid | v = lwh/3 |

surface area of a cube | 6s squared |

surface area of a cone | a = πr squared + πrL |

surface area of a sphere | a = 4πr squared |

Created by:
ndmsteach