Question 506484
The formula for the volume of a cylinder is, were V is the subject V = pier2h.
Change the subject of the equation to the height(h).
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The formula for the volume of a cylinder
{{{pi*r^2*h}}} = V
Make the subject h, divide both sides by {{{pi*r^2}}} 
h = {{{V/((pi*r^2))}}} 
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If the volume(V) is 20m3, and radius(r) is 2m what is the height(h)? 
h = {{{20/((pi*2^2))}}}
h = {{{20/((pi*4))}}}
Cancel the 4 into 20
h = {{{5/(pi)}}}
Use a calc and get
h = 1.59155 m is the height
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Confirm this
{{{pi*2^2*1.59155}}} = 20.000