I am currently working on my last MGMAT guide -5 (Geometry) and I don't see the formula or definition on Sphere/Cone/Hemisphere.
Usually when I solved the OG12
questions after working on MGMAT guide theory and problem set, I didn't see any extra ordinariliy different question in OG12
which is not covered in MGMAT guides
I am going to find it in Maths foundation or might go thru the articles on 3D geometry here on GC. But that makes me think - are there other topics that might come in GMAT but not covered in MGMAT guides
Or is it covered in advanced section?
No bias; but I am sincere proponent of: http://gmatclub.com/forum/gmat-math-book-87417.html
for basics' brush-up. GMAT club members did a splendid job putting it all together. Rest everything is practice and getting acquainted with the patterns, shortcuts and approach to solving different types of problems.MGMAT Geometry
is not too comprehensive, I agree. Sphere, hemisphere, cones are definitely part of GMAT, which you may have noticed while solving the OG sample questions.
I like MGMAT's:
Equations, Inequalities, and VICs
Fractions, Decimals, and Percents
as a launch pad. Practice after that is what counts more.
These MGMAT guides
include almost everything that's required topic-wise. But sighting the concern you have raised, it's quite possible that they may have missed on few topics. It will be really tedious to pinpoint what's missing though. I wouldn't worry about those few missing topics because one will surely find out about those during his/her practice tests. So, just carry on and get done with your MGMAT guides
Unfortunately, the 3-D solids that you mentioned about are not described even in the OG12
Math Review section. What do you say to that!!!
Please see "Math Review" section of the OG to get an idea what you must cover.