I have tried everything. I know the formula and how to solve it but no matter what my test keeps saying it is wrong.

Find the volume of a cylinder with a diameter of 6 inches and a height that is three times the radius. Use 3.14 for pi and round your answer to the nearest hundredth. (Hint: You may only enter numerals, decimal points, and negative signs in the answer blank)

Question

I have tried everything. I know the formula and how to solve it but no matter what my test keeps saying it is wrong. 

Find the volume of a cylinder with a diameter of 6 inches and a height that is three times the radius. Use 3.14 for pi and round your answer to the nearest hundredth. (Hint: You may only enter numerals, decimal points, and negative signs in the answer blank)

ranga · Answer

Volume of a cylinder = (pi)(r^2)h

Diameter = 6.  Radius is half the diameter.  So radius r = 3

Height is three times the radius.  So height h = 3 x r = 3 x 3 = 9

Just plug it into the formula for volume.

anonymous · Answer

I got 169.56

ranga · Answer

Volume =  (pi)(r^2)h = (3.14)(3^2)(9) = 3.14 x 9 x 9 = 254.34

anonymous · Answer

Oh I see what I did wrong.I squared 3 wrong by mistake

ranga · Answer

But you have to square 3.  radius r = 3 and you have to square it to get 9 as I did above.

anonymous · Answer

Right, okay I see. Thanks a lot!

ranga · Answer

you are welcome.

anonymous · Answer

Would you mind helping me with another one?