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Is there any site where I can find proofs of various polygon area formulas?

Like triangle, parallelogram etc. It would be good if everything was on the same page :)

Wikipedia usually explains how the formulae are achieved. I haven’t searched much.

I mean some are obvious: triangle, rectangle/parallelogram, regular penta/hexa/octogon.

This entry was posted on Tuesday, December 27th, 2011 at 2:32 am and is filed under area formulas. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

2 Responses to “Is there any site where I can find proofs of various polygon area formulas?”

  1. Wikipedia always has things like this. These are also common shapes so you can be guarenteed that the information is most likely correct.

    The circle proof requires calculus (or rather, I cannot see a way of actually proving it without it). But the other shapes use just common sense and basic mathematical reasoning.
    References :

  2. Wikipedia usually explains how the formulae are achieved. I haven’t searched much.

    I mean some are obvious: triangle, rectangle/parallelogram, regular penta/hexa/octogon.
    References :

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