How can I measure a frustum inside a frustum? If I know the measurements of a frustum A, how can I find the measurements of frustum B if I only know B's bottom radius, slanted side angle and volume?
This problem arose after finding how deep the booze in my cocktail glass is, but when not filling the glass to the brim.
If it makes a difference, I am mostly interested in the height of each layered nested frustum inside the container frustum.
heightA       =  80.00 mm
radiusBottomA =  40.00 mm
radiusTopA    =  57.00 mm
volumeA       = 597.24 mm³
slantA        =  81.79 mm
bottomAngleA  =  12.00 °  

heightB       =  ??
radiusBottomB =  40.00 mm
radiusTopB    =  ??
volumeB       = 500.00 mm³
slantB        =  ??
bottomAngleB  =  12.00 °


The graphic is supposed to depict a 2D side-view of a frustum containing another frustum. They are supposed to be symmetrical and the proportions are not matching the indicated measurements because I have poor MS Paint skills.

So when you are finding the area of a frustum, you are  basically finding the volume of one cone and subtracting it from the volume of another cone. So, when doing this problem, just find the area of the cone formed at a given height h and subtract it from the cone at the bottom with a radius of 40. 
