Dissecting a Cube into an H Shape and Two Cubes
This Demonstration shows a dissection reflecting the formula . This is done by dissecting a cube with side length into cubes with side lengths and and three congruent rectangular solids of dimensions , and , which are rearranged to form an H-shaped solid.
Forming the H shape from three rectangular solids was a reason for naming a special cube divided into 11 pieces the H-cube ("Kocka H") in [1, pp. 36–41].
 H. Kocka. "H-Cube." Logika & Razvedrilna Matematika. (Jun 12, 2019) www.logika.si/revija/revije-splet/Logika-2018-2019_4.pdf.