SOLUTION: The volume of a cylinder is approximately 800 cm3. If the cylinder is 16 cm tall what is its radius?

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Question 250201: The volume of a cylinder is approximately 800 cm3. If the cylinder is 16 cm tall what is its radius?
Answer by jsmallt9(3758) About Me  (Show Source):
You can put this solution on YOUR website!
The volume of a cylinder is:
V+=+pi%2Ar%5E2%2Ah
We know the V and the h, we should be able to find r:
800+=+pi%2Ar%5E2%2A%2816%29
Divide both sides by 16pi:
800%2F%2816pi%29+=+%28pi%2Ar%5E2%2A16%29%2F%2816pi%29
which simplifies to:
50%2Fpi+=+r%5E2
Find the square root of each side. (Since r is a radius we will ignore the negative solution.)
sqrt%2850%2Fpi%29+=+r

This is an exact answer. If you need a decimal approximation then use your calculator on the left side.