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how do you find the radius of a cylinder

 Nov 8, 2014

Best Answer 

 #4
avatar+128578 
+11

If we know the Volume, we can solve for the radius

V = pi X r^2 * h     divide both sides by pi * h

V /( pi * h) = r^2     take the positive square root of both sides

√[V /( pi * h) ]  = r

 

If we know the lateral surface area......we can do this

Sa = 2*pi*r * h     divide both sides by 2* pi *h

(Sa) / [ 1 * pi *h]   = r

 

 

 Nov 8, 2014
 #1
avatar+1090 
0

What information do you already have about the cylinder?

 Nov 8, 2014
 #2
avatar+1975 
0

the formula is

radius = the square root of Volume divided by pi x height

i think... sorry if im wrong im only in algebra 1-2

 Nov 8, 2014
 #3
avatar+1090 
0

They were asking for radius not volume, so I was confused. If they only have the volume, then the problem can't be answered.

 Nov 8, 2014
 #4
avatar+128578 
+11
Best Answer

If we know the Volume, we can solve for the radius

V = pi X r^2 * h     divide both sides by pi * h

V /( pi * h) = r^2     take the positive square root of both sides

√[V /( pi * h) ]  = r

 

If we know the lateral surface area......we can do this

Sa = 2*pi*r * h     divide both sides by 2* pi *h

(Sa) / [ 1 * pi *h]   = r

 

 

CPhill Nov 8, 2014
 #5
avatar+1090 
0

Yes, but you need to know the height.

 Nov 8, 2014
 #6
avatar
0

i need the hight

 Nov 8, 2014
 #7
avatar+128578 
0

I was assuming that we knew everything but the radius.......

 

 Nov 8, 2014
 #8
avatar+1090 
0

Can you give us all the information you have (like the actual problem)?

 Nov 8, 2014

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