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Mathematics 12 Online
OpenStudy (anonymous):

volume of pyramids and cone ..i need help!

OpenStudy (danjs):

okie

OpenStudy (jhannybean):

noted.

OpenStudy (danjs):

both are 1/3 times the base length times the height

OpenStudy (anonymous):

OpenStudy (anonymous):

OpenStudy (anonymous):

@Jhannybean

OpenStudy (anonymous):

can you help ? @Jhannybean

OpenStudy (jhannybean):

Volume o pyramid: \(\sf V=\dfrac{lwh}{3}\) Volume of cone: \(\sf V=\pi r^2\dfrac{h}{3}\)

OpenStudy (anonymous):

what does this formula apply to

OpenStudy (jhannybean):

to both of your diagrams

OpenStudy (anonymous):

what about this one

OpenStudy (jhannybean):

I am not sure what you are looking for, for this one. Volume of rectangular pyramid?

OpenStudy (anonymous):

volume of a square pyramid

OpenStudy (jhannybean):

Volume of square pyramid: \(\sf V = a^2\cdot \dfrac{h}{3}\)

OpenStudy (jhannybean):

Where \(a\) is one side of the base.

OpenStudy (anonymous):

so 24^2*20\3?

OpenStudy (jhannybean):

Which are you solving for, can you specify?

OpenStudy (anonymous):

Find the volume of the square pyramid shown. If necessary, round to the nearest tenth. thats what it said

OpenStudy (anonymous):

and i keep getting 3840 but its not an answer choice

OpenStudy (jhannybean):

Ok, I was wondering why you also asked for the cone and the other, confused me.

OpenStudy (jhannybean):

So for the square pyramid: \(\sf V = a^2\cdot \dfrac{h}{3}~,~\)\(a=24 \) We need to figure out our height.

OpenStudy (anonymous):

the height is 20

OpenStudy (jhannybean):

|dw:1418885102523:dw|

OpenStudy (jhannybean):

\[h = \sqrt{(20)^2 - (12)^2}\]

OpenStudy (anonymous):

where did the 12 come from ? just curious

OpenStudy (jhannybean):

Ok.

OpenStudy (jhannybean):

|dw:1418885170408:dw|

OpenStudy (jhannybean):

Do you see how it is 12 now?

OpenStudy (anonymous):

ohhhh ok i get it ,yes

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