Mathematics
12 Online
OpenStudy (anonymous):
volume of pyramids and cone ..i need help!
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OpenStudy (danjs):
okie
OpenStudy (jhannybean):
noted.
OpenStudy (danjs):
both are 1/3 times the base length times the height
OpenStudy (anonymous):
OpenStudy (anonymous):
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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
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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.
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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.
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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
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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