that first one is interesting. I was trying to use simultaneous equations but yea couldn't because r and h are variables. Nevertheless, I'll leave you to play around cos I have to go fiddle with integration:P
V=200cm^3
V=pir^2h (formula for cylinder)
so,
200=pir^2h
h=200/r^2pi (1)
SA=2pir^2 +...