anonymous
  • anonymous
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
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
here's a pic if it helps:)
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anonymous
  • anonymous
Volume of Prism = (5/2)ash = Ah where, a = apothem length, s = side, h = height, A=area
anonymous
  • anonymous
oky so (5/2)ash should equal the area multiplied by the height?

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anonymous
  • anonymous
yup\[{5\over2}\times (apothem) \times side \times height = Area \times Height \]
anonymous
  • anonymous
with side do you mean side length or the number of sides?
anonymous
  • anonymous
annd would height be the diameter?
anonymous
  • anonymous
7in apothem 30in length (if yu turn the prim up-side the length turns into height, right?) 12 inch side length = side
anonymous
  • anonymous
oh okay so the length would be the height. annd why is it 5/2 at the beginning is that some sort of equation?
anonymous
  • anonymous
hmm.. it's from deriving the equation... it's just like the area for a triagle = (1/2)bh
anonymous
  • anonymous
oh is there an equation for a pentagonal prism?
anonymous
  • anonymous
oh and in the equation you said it will = area* height, did you mean the area of the pentagon?
anonymous
  • anonymous
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!!
anonymous
  • anonymous
haha thank's (:
anonymous
  • anonymous
hey could you help me on a problem? i have it posted but i cant seem to get any responses. thanks<33
anonymous
  • anonymous
sorry i was eating, i'll look for yur post and try to help
anonymous
  • anonymous
Thanks so much C: and its the one with a triangular prism on top and a rectangular prism on bottom.
anonymous
  • anonymous
you should re-post the question, i can't find it hehe
anonymous
  • anonymous
haha okay I will thanks so much again:)
anonymous
  • anonymous
did you find it? :)

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