MacMahon, Percy Alexander, 1854-1929 · Cambridge [Eng.] The University press · leaf 68
it is clear that the projecting piece AKR will exactly fit into the recess AJB, and that the combined area of the transformed triangles will not be changed. The figure 55 <£ shews the piece CAKB fitting the piece AKBC. The conditions are satisfied because the compartment boundaries AKB, AJB are…
Mathematical recreations
Internet Archive · Cornell University Library · Public domain (published before 1931). Free to use for anything.
