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9058638

Flashcards by Idil Mogeh, updated more than 1 year ago

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7th grade Math (Geometry) Flashcards on Geometry, created by Idil Mogeh on 05/23/2017.

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Question | Answer |

Area of a Circle | A = π r ^2 |

Circumference of a Circle | C = 2 π r |

Area of Compound Shapes | Divide the shape into squares and rectangles, find their individual areas and then add them together. |

Interior Angles of Regular Polygons | (n-2) × 180° n = number of sides Then divide by 'n' to find individual angles. (If it is a irregular shape, then n=number of x/missing values) |

Exterior Angles of Regular Polygons | 360 ÷ a a = number of angles All of the exterior angles of regular polygons = 360* (If it is a irregular shape, then a=number of x/missing values) |

y=mx+c equations | If an equation of a line was Y=2x-4 it would mean that you would start at -4 on the Y axis (the one going up), you would find the points on the line by moving one to the right then two up. So your second point would be 1, -2 . |

Angles in parrallel lines | vertically opposite: b=c alternate: a=b corresponding: a=c supplementary: b+d=180 |

Volume of 3D shapes | prism: area of cross section (front face) x length sphere: 4/3 π r^3 cone: 1/3 π r^2 h |

Surface area | sphere: 4 π r^2 cone: π r l |

Area of trapezium | 1/2 (a+b) h |

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