MadSci Network: Physics |
I would say that "normal area" is the same as "cross-sectional area". It seems to me that both you and the Web site could be right, if you are meaning frontal cross-sectional area and the Web site means cross-sectional area as viewed from the top (or bottom!).
John Link, MadSci Physicist
Try the links in the MadSci Library for more information on Physics.