Illustration of "<a href="https://en.wikipedia.org/wiki/en:Squaring_the_square" class="extiw" title="w:en:Squaring the square">Mrs. Perkins's Quilt</a>" from: <a href="https://en.wikipedia.org/wiki/en:Henry_Ernest_Dudeney" class="extiw" title="w:en:Henry Ernest Dudeney">Henry Dudeney</a>: <i>Amusements in Mathematics</i>, 1917. – colorized: solution
unknown<br>(Upload and retouche by: <a href="//commons.wikimedia.org/wiki/User:Mosmas" title="User:Mosmas">Thomas Schoch</a>)
<a href="https://en.wikipedia.org/wiki/en:Project_Gutenberg" class="extiw" title="w:en:Project Gutenberg">Project Gutenberg</a><br><b>eBook:</b> <a rel="nofollow" class="external free" href="http://www.gutenberg.org/ebooks/16713">http://www.gutenberg.org/ebooks/16713</a><br><b>Illustration:</b> <a rel="nofollow" class="external free" href="http://www.gutenberg.org/files/16713/16713-h/images/q173.png">http://www.gutenberg.org/files/16713/16713-h/images/q173.png</a>