Sunday, February 3, 2008

Pentagons

In case you need some help getting the angles right, see this.

I misspoke in class earlier this week when I said the outer angles are 72 degrees. The inside angles when drawing lines from the center to each vertex are 72 degrees, the outer angles are 108 degrees.
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2 comments:

  1. AnonymousFebruary 3, 2008 at 7:01 PM

    so does that mean that everything should stay the same except for we should use (1-cos108) instead of (1-cos72)?

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  2. pleclairFebruary 3, 2008 at 7:39 PM

    for number 9, yes, use 108 degrees everywhere instead.

    for number 10, the length from a vertex to the center does use the 72 degree angle, so nothing changes on that one.

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