Harriot, Thomas, Mss. 6785

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              <s xml:space="preserve">[
                <emph style="bf">Commentary:</emph>
              </s>
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            <p>
              <s xml:space="preserve"> The reference on this page is to Petrus Ramus (Pierre de la
                <emph style="it">Scholarum mathematicarum libri unus et triginta</emph>
                <ref id="ramus_1569"> (Ramus </ref>
              . (The same diagram appears in the 1599 edition, but there on page 314.) On pages 319–320 (the last two pages of the 1569 edition) Ramus states and proves what is usually known as Heron's Rule, for the area of a triangle given all three of its sides
                <ref id="ramus_1569" target="http://docnum.u-strasbg.fr/cdm/compoundobject/collection/coll7/id/41376"> (Ramus 1569, </ref>
              . Harriot's diagram is the same as that given by Ramus, but he translates Ramus's verbal proof into symbols.
                <lb/>
              See also Add MS
                <ref target="http://echo.mpiwg-berlin.mpg.de/ECHOdocuView?url=/permanent/library/KN1CRTZ2/&start=680&viewMode=image&pn=689"> f. </ref>
              , for the same problem and a similar diagram, there from Clavius,
                <emph style="it">Geometria practica</emph>
                <ref id="clavius_1606"> (Clavius </ref>
              . </s>
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            <emph style="super">h</emph>
          olæ mathematicæ Rami. pag.
            <lb/>
          [
            <emph style="bf">Translation: </emph>
            <emph style="it">Scholarum mathematicorum</emph>
          of Ramus, page 320. </head>
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Impressum