 
 <translate> 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). <hau> Tun da radius ne square, mafi girma girma Silinda zai yi mafi girma yiwu radius. Don cimma wannan, bari mafi ƙarancin girman akwatin rectangular ya zama tsayi. Saboda haka, zai yi 12x10 nisa x tsawon. Babban silinda dole ne ya dace da girma biyu, don haka dole ne ya kasance a mafi yawan diamita na 10, don haka radius zai zama 5. Amsar ita ce: (C). 