MHB Estimate Paint Amount for Hemispherical Dome w/ Differentials

[Micah2]

Use differentials to estimate the amount of paint needed to apply a coat of paint 0.03 cm thick to a hemispherical dome with diameter 46 m. (Round your answer to two decimal places.)

First I list what I am given:
Diameter: 46m
DR: 0.0003m (converted from the 0.03cm that was given)
DV: ?

Volume of a Sphere = 4/3 pi r^3
But volume of a half a Sphere = 2/3 pi r^3
And Radius = Diameter/2

So...dv = 2 pi (23m)^2 (0.0003m)

Using a Calculator I am given 0.3174. The question asks to round it to two decimal places, which would be 0.32.
All homework is done online but apparently this answer is still incorrect. I appreciate all and any help to sort this out. :(

 

[skeeter]

you forgot the $\pi$ ...

 

[Micah2]

you forgot the $\pi$ ...

Doh! Yes, that did the trick. Thank you so much! :)