<prompt> Kutumia pembejeo ya mtumiaji, programu ya Ruby inapaswa kwanza kuthibitisha ikiwa pembejeo ya mtumiaji ni halali nambari kubwa kuliko 0 na kisha kuzalisha kiasi kilichotokana na kuzunguka hadi nafasi mbili za decimal.  <response>: Kulinganisha icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron na icosahedron. 