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# 8Ma_Formulas

### 8th Grade Math Formulas

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

Perimeter of a Square | P = 4s |

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

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

What is Pi(π)? | π = 3.14 or π = 22/7 |

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

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

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

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

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

Area of an Ellipse | A = πab |

Volume of a Prism | V = Bh |

Volume of a Cylinder | V = Bh |

Volume of a Pyramid | V = 1/3Bh |

Volume of a Cone | V = 1/3Bh |

Volume of a Sphere | V = 4/3πr to the 3rd power |

Surface Area of a Cube (total) | S = 6s to the 2nd power |

Surface Area of a Prism (lateral) | S = Ph |

Surface Area of a Prism (total) | S = Ph + 2B |

Surface Area of a Pyramid (lateral) | S = 1/2Pl |

Surface Area of a Pyramid (total) | S = 1/2Pl + B |

Surface Area of a Cylinder (lateral) | S = 2πrh |

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

Pythagorean Theorem | a to the 2nd power + b to the 2nd power = c to the 2nd power |

Simple Interest Formula | I = prt |

1 kilometer | 1000 meters |

1 meter | 100 centimeters |

1 centimeter | 10 millimeters |

1 mile | 1760 yards |

1 mile | 5280 feet |

1 yard | 3 feet |

1 foot | 12 inches |

1 liter | 1000 milliliters |

1 gallon | 4 quarts |

1 gallon | 128 fluid ounces |

1 quart | 2 pints |

1 pint | 2 cups |

1 cup | 8 fluid ounces |

1 kilogram | 1000 grams |

1 gram | 1000 milligrams |

1 ton | 2000 pounds |

1 pound | 16 ounces |

1 year | 365 days |

1 year | 12 months |

1 year | 52 weeks |

1 week | 7 days |

1 day | 24 hours |

1 hour | 60 minutes |

1 minute | 60 seconds |