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 diagram on this page is copied from Clavius,
                <emph style="it">Geometria practica</emph>
              (1604), page 176. On pages 175 to 178 Clavius stated and proved what is usually known as Heron's Rule, for the area of a triangle given its sides. Harriot translates Clavius's verbal proof into symbols, and adds variants of his own.
                <lb/>
              In the second edition of the
                <emph style="it">Geometria practica</emph>
              , of 1606, the same text appears on pages 158 to 161, with the diagram on page 159.
                <ref id="clavius_1606" target="http://echo.mpiwg-berlin.mpg.de/ECHOdocuView?url=http%3A%2F%2Fcontent.mpiwg-berlin.mpg.de%2Fmpiwg%2Fonline%2Fpermanent%2Flibrary%2FFBVYV7EH%2Findex.meta&viewMode=images&mode=texttool&pn=189"> (Clavius 1606, </ref>
                <lb/>
              See Also Add MS
                <ref target="http://echo.mpiwg-berlin.mpg.de/ECHOdocuView?url=/permanent/library/KN1CRTZ2/&start=60&viewMode=image&pn=65"> f. </ref>
              , for the same problem and a similar diagram, there from Ramus,
                <emph style="it">Scholarum mathematicarum libri unus et triginta</emph>
                <ref id="ramus_1659"> (Ramus </ref>
              . </s>
              <s xml:space="preserve">]</s>
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          <head xml:space="preserve" xml:lang="lat">2.3
            <emph style="super">o</emph>
          Cla. pa. 176. Geom.
            <lb/>
          [
            <emph style="bf">Translation: </emph>
          Clavius, page 176,
            <emph style="it">Geometria practica</emph>
          </head>
          <p xml:lang="lat">
            <s xml:space="preserve"/>
          </p>
          <p xml:lang="lat">
            <s xml:space="preserve"> Ego aliter, et
              <lb/>
            [
              <emph style="bf">Translation: </emph>
            Another way of my own, much ]</s>
          </p>
          <p xml:lang="lat">
            <s xml:space="preserve"> Ego
              <lb/>
            [
              <emph style="bf">Translation: </emph>
            Another way of ]</s>
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