The radius of a circle is the distance from the center of a circle to any point on the circle. If you place two radii end to end in a circle, you would have the same length as one diameter. Thus, the diameter of a circle is twice as long as the radius.

Pi is the relationship fo the circumference of a circle to the diameter. Thus for any circle, if you divide the circumference by the diameter, you get a value close to 3.14.

When the pentagon was built the original figure was supposed to be a circel but they over estimated the area of the land to the circumference of the circle and ended up with a pentagon.

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This entry was posted on April 16, 2010 at 2:00 pm and is filed under Uncategorized. You can follow any responses to this entry through the RSS 2.0 feed.
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April 16, 2010 at 8:14 pm |

good to know

April 16, 2010 at 8:15 pm |

good to know i liek pentagons

April 19, 2010 at 1:29 pm |

This is interesting. I never knew that the pentagon was suppose to be a circle. That is a good example if geometry in real like because that the only building that is not just a square or a rectangle.

April 21, 2010 at 6:04 pm |

This had some crazy information!! I learned alot about circles just reading it!

April 21, 2010 at 6:06 pm |

I never knew that about the pentagon. Thats pretty interesting and it makes sense

April 21, 2010 at 6:07 pm |

that is confusing but i like the effort nice job

April 27, 2010 at 4:41 pm |

I never knew it was supposed to be a circle that is interesting. It would be really cool to have a circle building.