hinged dissections
... that the concept of hinged dissections was popularized by Henry Dudeney, who introduced the hinged dissection of a square into a triangle in his 1907 book The Canterbury Puzzles?
... that the concept of <b id="mwrQ"><a href="./Hinged_dissection" id="mwrg" rel="mw:WikiLink" title="Hinged dissection">hinged dissections</a></b> was popularized by <a href="./Henry_Dudeney" id="mwrw" rel="mw:WikiLink" title="Henry Dudeney">Henry Dudeney</a>, who introduced the hinged dissection of a square into a triangle <i id="mwsA">(pictured)</i> in his 1907 book <i id="mwsQ"><a href="./The_Canterbury_Puzzles" id="mwsg" rel="mw:WikiLink" title="The Canterbury Puzzles">The Canterbury Puzzles</a></i>?