 
<translate> Ebe ọ bụ na okirikiri ahụ bụ square, cylinder kachasị ukwuu ga-enwe okirikiri kachasị ukwuu. Iji mezuo nke ahụ, ka obere akụkụ nke igbe rektangulu bụrụ ịdị elu. Ya mere, ọ ga-enwe 12x10 n'obosara x ogologo. Ogwe kachasị buru ibu ga-adaba na akụkụ abụọ ahụ, yabụ na ọ ga-enwerịrị ihe dịka 10 n'obosara, yabụ na radius ga-abụ 5. Azịza ya bụ: (C). <eng> Since the radius is squared, the biggest volume cylinder will have the biggest possible radius. To achieve that, let the smaller dimension of the rectangular box be the height. So, it will have 12x10 width x length. The biggest cylinder must fit both dimensions, so it must have at most a diameter of 10, so the radius will be 5.
The answer: (C). 