Wha?Is the w7 even parabolic? It looks closer to a hemisphere to me.
^^^Wha?
A hemisphere is a parabolic shape, there, buddy //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
take a cross sextion of the cone, and you are looking at a parabola. there's no need to get all technical in here with growth, it looks like a parabola on a piece of graph paper.A parabola has exponential growth. The sphere, or half of it is technically a special case that does not display exponential behavior.
Depending on how exact you like to be, you can calculate it as a hemisphere, but if it is parabolic you wont get the exact answer.
That's all I was saying.