Please help :)

A cylinder has a diameter of 10 inches and a height four times its radius. What is its volume?

f 40,000π cu in.
g 4,000π cu in.
h 500π cu in.
j 2,000π cu in.

Question

Please help :) 

A cylinder has a diameter of 10 inches and a height four times its radius. What is its volume?

f	40,000π cu in.
g	4,000π cu in.
h	500π cu in.
j	2,000π cu in.

anonymous · Answer

if the diameter is 10, the radius is 5...

so if the height is 4*r, what is the height?

the formula for the volume is V=(area of base) * h
the area of the base is $$A=\pi r^{2}$$

so $$V=\pi r^{2}h$$

anonymous · Answer

Yes and i got 1570 but thats not an answer choice... @mtbender74

anonymous · Answer

1 sec...let me work it out

anonymous · Answer

that's because the answer wants pi left alone...calculate the $$r^{2}h$$ part and put pi on the end... :)

anonymous · Answer

Oh 500 pie thanks :) @mtbender74

anonymous · Answer

no problem :)