**TI86** Program file dated 06/23/04, 19:56 y iSPHERDERigìoëD1/D1/-r=((3V)/(4Ä))^(1/3) r'=V'/(4Är)oëD3/D1/-A'=8Är*r', V'=4Är*r'oëD4/D1/-V=4Är^3/3x