Need help in maths :S (1 Viewer)

[iBeSimpson]

If V = (pi)r^2h is the volume of a cylinder, find the exact value of r when V = 9 and h = 16

Please help, i have a test on questions similar to this in my maths halfyearly D:

can you explain the steps

Thanks ~

 

[Drongoski]

If V = (pi)r^2h is the volume of a cylinder, find the exact value of r when V = 9 and h = 16

Please help, i have a test on questions similar to this in my maths halfyearly D:

can you explain the steps

Thanks ~

V = pi x r² x h

9 = pi x r² x 16

r² = 9/(16 pi)

r = 3/(4 sqr(pi))