4 * ( 9 + 5 + 6 ) = 4 * 20 = 80 см
S = 2 * ( 9 * 5 + 5 * 6 + 6 * 9 ) = 2 * ( 45 + 30 + 54 ) = 2 * 129 = 258 см²
4 * ( 9 + 5 + 6 ) = 4 * 20 = 80 см
S = 2 * ( 9 * 5 + 5 * 6 + 6 * 9 ) = 2 * ( 45 + 30 + 54 ) = 2 * 129 = 258 см²