William Chapple
... that William Chapple discovered Euler's theorem and Poncelet's porism?
... that <b id="mwBhA"><a href="./William_Chapple_(surveyor)" id="mwBhE" rel="mw:WikiLink" title="William Chapple (surveyor)">William Chapple</a></b> discovered <a href="./Euler's_theorem_in_geometry" id="mwBhI" rel="mw:WikiLink" title="Euler's theorem in geometry">Euler's theorem</a> and <a href="./Poncelet's_closure_theorem" id="mwBhM" rel="mw:WikiLink" title="Poncelet's closure theorem">Poncelet's porism</a>?