Mr Crypto: If you have a tablet or capsule of radius l, then its cross-sectional area is pi*l*l.
If you have a sow of girth radius g and length y, then its volume is (to a first approximation) pi*g*g*y.
If you urinate (urine having density d) into a canister with radius s and height e, the weight of the urine will be pi*s*s*e*d.
