Kailee1423
  • Kailee1423
Find the volume of the square pyramid shown. Round to the nearest tenth if necessary. (Pic in comments)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
Kailee1423
  • Kailee1423
@phi
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phi
  • phi
do you know the formula for the volume of a pyramid?
phi
  • phi
It should be in your notes. or see http://www.basic-mathematics.com/volume-of-a-pyramid.html

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Jhannybean
  • Jhannybean
Just curious, why is it divided by 3?
Kailee1423
  • Kailee1423
1/3Bh is the formula and I did it and got 55 but it was wrong
phi
  • phi
B is short for the area of the base. in this case the area of a square with sides = 11
Kailee1423
  • Kailee1423
bh isnt base*height?
Jhannybean
  • Jhannybean
It is.
Kailee1423
  • Kailee1423
Oh there is something in my book about b being area of the base in a problem
phi
  • phi
in the formula for the volume of a pyramid 1/3 Area of base times height the area of the base is sometimes abbreviated to B this is confusing. it does not mean the length of a side. It is just a "reminder" (which means you have to memorize this) B is AREA of the the base
Kailee1423
  • Kailee1423
So instead of B being 11, it would be 11*11?
phi
  • phi
exactly
Kailee1423
  • Kailee1423
After doing that, the volume should be 605
phi
  • phi
yes, 15/3 * 11*11 = 5*121= 605 putting in the units 605 cm^3 or 605 cc
Kailee1423
  • Kailee1423
Thanks again! I'll make another question lol
phi
  • phi
**Just curious, why is it divided by 3?*** @Jhannybean I am sure we can derive it with calculus, and maybe just geometrically But I remember Archimedes found the volume of a cone was 1/3 the volume of the enclosing cylinder, and he was so proud of finding that, he had it engraved on his tombstone.
Jhannybean
  • Jhannybean
Oh, nice.

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