Understanding Circles Worksheet



Understanding Circles Worksheet Answer Key and Grading Rubric

Each correct answer is worth 5 points

Find the Circumference for each.

Round to the nearest hundredth. Assume [pic]= 3.14

|1. |2. |

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|[pic] |[pic] |

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|g = 20 yd |m = 46 cm |

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|  62.8 yd |288.88 cm |

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|3. |4. |

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|[pic] |[pic] |

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|s = 11 ft |e = 4 cm |

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|69.08 ft |25.12 cm |

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|5. |6. |

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|[pic] |[pic] |

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|s = 10 cm |m = 83.951 m |

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|62.8 cm |527.21 m |

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|7. |8. |

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|[pic] |[pic] |

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|g = 13.9 in |e = 26.8 mi |

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|43.65 in |168.30 mi |

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Complete the table for each circle.

Round to the nearest hundredth. Use 3.14 for [pic]

Radius Diameter Circumference

9. 12mm 24mm 75.36mm

10. 7k 14k 43.96k

11. 6.60m 13.20m 41.45 m

12. 8ft 16ft 50.24ft

13. 2.5 in 5 in 15.7 in

14. 11.7m 23.4m 73.48m

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