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anonymous

  • 5 years ago

Find the volume of a regular pentagonal prism with a 7in apothem, 12 inch side length and a 30in length, im really stuck on this so help would be awesome!<3

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  1. anonymous
    • 5 years ago
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    here's a pic if it helps:)

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  2. anonymous
    • 5 years ago
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    Volume of Prism = (5/2)ash = Ah where, a = apothem length, s = side, h = height, A=area

  3. anonymous
    • 5 years ago
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    oky so (5/2)ash should equal the area multiplied by the height?

  4. anonymous
    • 5 years ago
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    yup\[{5\over2}\times (apothem) \times side \times height = Area \times Height \]

  5. anonymous
    • 5 years ago
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    with side do you mean side length or the number of sides?

  6. anonymous
    • 5 years ago
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    annd would height be the diameter?

  7. anonymous
    • 5 years ago
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    7in apothem 30in length (if yu turn the prim up-side the length turns into height, right?) 12 inch side length = side

  8. anonymous
    • 5 years ago
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    oh okay so the length would be the height. annd why is it 5/2 at the beginning is that some sort of equation?

  9. anonymous
    • 5 years ago
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    hmm.. it's from deriving the equation... it's just like the area for a triagle = (1/2)bh

  10. anonymous
    • 5 years ago
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    oh is there an equation for a pentagonal prism?

  11. anonymous
    • 5 years ago
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    oh and in the equation you said it will = area* height, did you mean the area of the pentagon?

  12. anonymous
    • 5 years ago
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    OH! never mind i just didnt read ur answer right I get how you got 5/2 xD and this makes perfect sense now so thanks so much you're really smart!!

  13. anonymous
    • 5 years ago
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    haha thank's (:

  14. anonymous
    • 5 years ago
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    hey could you help me on a problem? i have it posted but i cant seem to get any responses. thanks<33

  15. anonymous
    • 5 years ago
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    sorry i was eating, i'll look for yur post and try to help

  16. anonymous
    • 5 years ago
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    Thanks so much C: and its the one with a triangular prism on top and a rectangular prism on bottom.

  17. anonymous
    • 5 years ago
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    you should re-post the question, i can't find it hehe

  18. anonymous
    • 5 years ago
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    haha okay I will thanks so much again:)

  19. anonymous
    • 5 years ago
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    did you find it? :)

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