Math Education Weekly, fifth grade, Volume II, No.39 Answer
The strategist has two wires with the same length, and he just welded one of them into a cube frame with a length of 12 cm.
There are no redundant wires, so it is planned to weld another wire to make a cuboid frame with a length of 10 cm and a width of 8 cm (no redundant wires). What is the height of this cuboid?