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# Quadratic Circles

### Graphing and calculating circles

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

What is the center of this circle? x^2 + y^2 = 16 | center = (o,o) |

What is the radius of this circle? (x+3)^2 + (y-2)^2 = 36 | radius = 6 |

Is this equation a circle or a parabola? (x-7)^2 = 9 - (y+2)^2 | Circle |

What is the center of this circle? x^2 + y^2 + 6x - 4y = 12 | center = (-3,2) |

What is the radius of this circle? x^2 + y^2 -10x + 2y = -10 | radius = 4 |

What is the center of this circle? (x+2)^2 + y^2 = 30 | center = (-2,0) |

What is the radius of this circle? (y-1)^2 - 25 = -(x+3)^2 | radius = 5 |

What is the equation of a circle with a radius of 3 and a center at (-1,0) ? | (x+1)^2 + y^2 = 9 |

What is the equation of a circle with a radius of 1 and a center at (10, -12) ? | (x-10)^2 + (y+12)^2 = 1 |

What is the radius of this circle? (x^2)/5 + (y^2)/5 = 20 | radius = 10 |

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