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Math Help - Volume of a pentagonal prism

  1. #1
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    Volume of a pentagonal prism

    Find the volume of a regular pentagonal prism with a height of 5 feet and a perimeter of 20 feet

    Is there an easier way to find the area of the prism with out finding the area of the base then multiply by the height.

    to find the area of the base i did it (4^2*5)/(4tan(pi/5) can this be done easier?

    Thank you
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  2. #2
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    This link could be helpful

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