anonymous
  • anonymous
I need help finding the volume of this pentagonal pyramid !!!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
amistre64
  • amistre64
whatcha stuck on?
anonymous
  • anonymous
First of all , is there anyway I can draw a picture on here to make it easier?
amistre64
  • amistre64
lol ... not that I have found

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amistre64
  • amistre64
there is an attach file button here, but it is nnew. might allow you to post a pic tho
anonymous
  • anonymous
ehh, nahh. i'll just attempt to explain. okay so each side of the base has a length of 16 cm. Then the base has a annulus of 11. And it looks like the height is 36 cm
amistre64
  • amistre64
annulus; thats a term I aint familiar with.. can you explain it?
anonymous
  • anonymous
a washer shape
anonymous
  • anonymous
it's the length from the center of the shape to the middle of the edge of the side
anonymous
  • anonymous
circular disk with a hole missing from the center
anonymous
  • anonymous
maybe i'm not using the right term
amistre64
  • amistre64
ahhh; it looks like we could find the rea of on section of it by using the base and the height and the side length to help us
amistre64
  • amistre64
my keyboard hates me....
anonymous
  • anonymous
lol
anonymous
  • anonymous
so how do we do it
amistre64
  • amistre64
what methods do we know? is this calculus or something else?
anonymous
  • anonymous
geometry. . . lol
amistre64
  • amistre64
so we have a right triangle that forms the base and height, we have a width of ....whatever a side was all the way to 0 at the tip....
anonymous
  • anonymous
okay. here, can u wait a minute im gonna try to draw a picture of it and attach the file
amistre64
  • amistre64
http://www.mathsisfun.com/geometry/pentagonal-pyramid.html gives us the volume as: 1/3 [base area] times height
anonymous
  • anonymous
yes i know that.
amistre64
  • amistre64
And area of pent is: (length of 1 side)^2 x 1.7
anonymous
  • anonymous
what is a pent
amistre64
  • amistre64
Area = 16^2(1.7)(36)/3 is what it looks to be. pentagon
anonymous
  • anonymous
oh. ha. okay. so you took 16 to the second power , but where did u get 1.7?
anonymous
  • anonymous
1 Attachment
amistre64
  • amistre64
1.7 is what someone smarter than me got when they figured out the formula for the area of a pentagon :) s^2(1.7) = area of pentagon
anonymous
  • anonymous
the teacher gave us the answers because this a review for a test on monday. and she said the answer should be 5260. i just wanna see how she got there so i can do it on the test
anonymous
  • anonymous
okay... i think. lol
anonymous
  • anonymous
i meant 5280cm3. my bad
amistre64
  • amistre64
I get 5222.4 but is close enough to account for rounding and such
amistre64
  • amistre64
when we chop of decimals; we skew the answers... so it all depends on how it was calculated..
anonymous
  • anonymous
yeah. okay and explain to me where you got 36 please
amistre64
  • amistre64
you said the height was 36. (1/3) (base area) (height) base area = (side^2)(1.7)
anonymous
  • anonymous
ohhh wow. duhh. sorry. brain fart lol
amistre64
  • amistre64
:)
amistre64
  • amistre64
do you remember that you asked about the volume of a pentagonal pyramid :) time passed and we got to here :)
anonymous
  • anonymous
ha , yes. okay that works.
anonymous
  • anonymous
do you have time for some more questions?
amistre64
  • amistre64
fraid not, library closes in 10 minutes and my internet goes with it... but have a great day :)
anonymous
  • anonymous
okay thank you! you too!

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