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heather040200
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Help! I give medals:) pic below
Find the volume.A hemispherical tank has a total surface area of 243pi squared(this includes the circular base area).Show work
 one year ago
 one year ago
heather040200 Group Title
Help! I give medals:) pic below Find the volume.A hemispherical tank has a total surface area of 243pi squared(this includes the circular base area).Show work
 one year ago
 one year ago

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heather040200 Group TitleBest ResponseYou've already chosen the best response.0
dw:1368065262840:dw
 one year ago

heather040200 Group TitleBest ResponseYou've already chosen the best response.0
@e.mccormick @timo86m @knock @mathslover think one of u could help me out plezz :)
 one year ago

timo86m Group TitleBest ResponseYou've already chosen the best response.0
what is the formula for area of a sphere?
 one year ago

heather040200 Group TitleBest ResponseYou've already chosen the best response.0
v=4/3pir^3
 one year ago

timo86m Group TitleBest ResponseYou've already chosen the best response.0
it's A=4*Pi*r^2 but you want half so 2pi r^2=A solve for r :)
 one year ago

timo86m Group TitleBest ResponseYou've already chosen the best response.0
2pi r^2=A A/(2 pi)=r^2 divide both sides by 2pi sqrt(A/(2 pi))=r take sqrt of both sides plug in the area in A :) sqrt((243*pi^2)/(2 * pi))=r
 one year ago

knock Group TitleBest ResponseYou've already chosen the best response.0
I think you should include the surface of the circular base, doesn't?
 one year ago

timo86m Group TitleBest ResponseYou've already chosen the best response.0
i get like 19.5
 one year ago

heather040200 Group TitleBest ResponseYou've already chosen the best response.0
me to n the surface area they gave me is 243pi squared
 one year ago

heather040200 Group TitleBest ResponseYou've already chosen the best response.0
then do i do SA=1/24pir^2
 one year ago

heather040200 Group TitleBest ResponseYou've already chosen the best response.0
and v=1/2pi cubed
 one year ago

e.mccormick Group TitleBest ResponseYou've already chosen the best response.1
Did you remember the base in the surface area formula?
 one year ago

heather040200 Group TitleBest ResponseYou've already chosen the best response.0
is it S=B+1/2Cl=pir squared+pirl
 one year ago

razor99 Group TitleBest ResponseYou've already chosen the best response.0
@ heather the volume of a hemisphere is 2/3 pi r^2
 one year ago

heather040200 Group TitleBest ResponseYou've already chosen the best response.0
volume=253.5??
 one year ago

razor99 Group TitleBest ResponseYou've already chosen the best response.0
I mean the formulae
 one year ago

heather040200 Group TitleBest ResponseYou've already chosen the best response.0
so is the volume 253.5??
 one year ago

heather040200 Group TitleBest ResponseYou've already chosen the best response.0
ya ig
 one year ago

razor99 Group TitleBest ResponseYou've already chosen the best response.0
I guess so
 one year ago

e.mccormick Group TitleBest ResponseYou've already chosen the best response.1
I got a very different number.
 one year ago

e.mccormick Group TitleBest ResponseYou've already chosen the best response.1
Find the volume. A hemispherical tank has a total surface area of 243pi squared (this includes the circular base area). Show work Therefore: Half SA of Sphere + A of base = 243 SA Sphere = \(4\pi r^2\) A of Circle = \(\pi r^2\) \[\frac{1}{2}4\pi r^2+\pi r^2=243\\ \implies 3\pi r^2=243\\ \implies \pi r^2=81\\ \implies r^2=\frac{81}{\pi}\\ \implies r=\frac{9}{\sqrt{\pi}}\] Did you follow that for finding the radius?
 one year ago

razor99 Group TitleBest ResponseYou've already chosen the best response.0
To radius I get 4.39 so when it get round off to 2 decimal its 4.40
 one year ago

razor99 Group TitleBest ResponseYou've already chosen the best response.0
This is the volume 356.19
 one year ago

e.mccormick Group TitleBest ResponseYou've already chosen the best response.1
Or just leave it with the root of pi since that will partially cancel in the next step when doing area. Always save constant conversion until the last step for greater accuracy.
 one year ago

e.mccormick Group TitleBest ResponseYou've already chosen the best response.1
@razor99 r=4.39? How?
 one year ago
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