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 3 years ago
The volume of a square based pyramid is 81 cubic meters. What is the volume of the cube with the same side length and height?
A)9m3
B)27m3
C)243m3
D)729m3
moderator help
 3 years ago
The volume of a square based pyramid is 81 cubic meters. What is the volume of the cube with the same side length and height? A)9m3 B)27m3 C)243m3 D)729m3 moderator help

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amistre64
 3 years ago
Best ResponseYou've already chosen the best response.1the volume of the base?

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.1The volume of "a square based pyramid" is 81 cubic meters. What is the volume of "the cube" with the same side length and height? thats better

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.1the volume of any pointy shape is: (1/3) (base area) (height) to wit; 81 = (1/3) (base area) (h) ; multiply thru by 3 3(81) = s^2 * h ; s^2 refers to the square base area, divide out the h. 243/h = s^2 ; now square root each part sqrt(243/h) = s

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.1hmmm, prolly still not reading it correctly; cube tends to mean a shape with sides and height being equal, but this might mean a cube like shape in general

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.1if height = side length we get sqrt(243/s) = s 243/s = s^2 243 = s^3 s = cbrt(243) .... might be a better interpretation but its hard to tell with the way it is written

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.1the volume would then be cbrt(243)^3 = 243m^3 which is prolly the right answer
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