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Kailee1423
 one year ago
Find the volume of the square pyramid shown. Round to the nearest tenth if necessary. (Pic in comments)
Kailee1423
 one year ago
Find the volume of the square pyramid shown. Round to the nearest tenth if necessary. (Pic in comments)

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phi
 one year ago
Best ResponseYou've already chosen the best response.1do you know the formula for the volume of a pyramid?

phi
 one year ago
Best ResponseYou've already chosen the best response.1It should be in your notes. or see http://www.basicmathematics.com/volumeofapyramid.html

Jhannybean
 one year ago
Best ResponseYou've already chosen the best response.0Just curious, why is it divided by 3?

Kailee1423
 one year ago
Best ResponseYou've already chosen the best response.11/3Bh is the formula and I did it and got 55 but it was wrong

phi
 one year ago
Best ResponseYou've already chosen the best response.1B is short for the area of the base. in this case the area of a square with sides = 11

Kailee1423
 one year ago
Best ResponseYou've already chosen the best response.1bh isnt base*height?

Kailee1423
 one year ago
Best ResponseYou've already chosen the best response.1Oh there is something in my book about b being area of the base in a problem

phi
 one year ago
Best ResponseYou've already chosen the best response.1in 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
 one year ago
Best ResponseYou've already chosen the best response.1So instead of B being 11, it would be 11*11?

Kailee1423
 one year ago
Best ResponseYou've already chosen the best response.1After doing that, the volume should be 605

phi
 one year ago
Best ResponseYou've already chosen the best response.1yes, 15/3 * 11*11 = 5*121= 605 putting in the units 605 cm^3 or 605 cc

Kailee1423
 one year ago
Best ResponseYou've already chosen the best response.1Thanks again! I'll make another question lol

phi
 one year ago
Best ResponseYou've already chosen the best response.1**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.
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