The formula being used is V=

r^2(h/3)
V≈235
V=235.62 to be approximate
Hai! You're gonna need 15 shelves for all those toys. X)
Your point (0,0) on the blue shape, when translated to the green shape, becomes (-6,-8)
A. parallelogram
B. I believe it'd be around (11.2,7.5)
C. √(10-5)^2+(9-4)^2 = 21, so yes they bisect