Cataneo, Girolamo, Hier. Cataneus de arte bellica, sive, de designandis ac construendis arcibus & propugnaculis, necnon & de iis oppugnandis, expugnandis ac propugnandis : de itinere exercitus, ac castrametatione, quando expediat manus cum hoste conserere, 1600

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            <s xml:id="echoid-s321" xml:space="preserve">
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            lateribus ſeu angulis præditas: </s>
            <s xml:id="echoid-s322" xml:space="preserve">item ad digno-
              <lb/>
            ſcendum an angulus figuræ æquilateræ & </s>
            <s xml:id="echoid-s323" xml:space="preserve">æ-
              <lb/>
            quiangulæ, major vel minor ſit recto. </s>
            <s xml:id="echoid-s324" xml:space="preserve">Ac pri-
              <lb/>
            mò de angulis figurarum rectilinearum a-
              <lb/>
            getur, vt innoteſcat quot angulis rectis illi æ-
              <lb/>
            quipolleant.</s>
            <s xml:id="echoid-s325" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s326" xml:space="preserve">Statuamus primò, figuram illam eſſe trium laterum:
              <lb/>
            </s>
            <s xml:id="echoid-s327" xml:space="preserve">duo ſubtrahemus, remanebit vnum, quod duplicatum
              <lb/>
            duo facit: </s>
            <s xml:id="echoid-s328" xml:space="preserve">Triangulum igitur, ſeu trilatera figura, duos
              <lb/>
            angulos rectos habet. </s>
            <s xml:id="echoid-s329" xml:space="preserve">Secundò agamus de figura qua-
              <lb/>
            drilatera ſeu quatuor laterum: </s>
            <s xml:id="echoid-s330" xml:space="preserve">duobus ſubſtractis, duo
              <lb/>
            relinquentur, quibus duplicatis, fient quatuor. </s>
            <s xml:id="echoid-s331" xml:space="preserve">Qua-
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            dranguli ergo quatuor anguli, quatuor rectis ſunt æ-
              <lb/>
            quales. </s>
            <s xml:id="echoid-s332" xml:space="preserve">Tertiò ſuccedit Pentagonum, ſeu quinquelate-
              <lb/>
            ra figura: </s>
            <s xml:id="echoid-s333" xml:space="preserve">ex ea duobus lateribus ſubſtractis remane-
              <lb/>
            bunt tria, quibus duplicatis apparebit Pentagoni an-
              <lb/>
            gulos ſex rectis æquales eſſe. </s>
            <s xml:id="echoid-s334" xml:space="preserve">Ac per hanc regulam no-
              <lb/>
            bis innoteſcet quot rectis angulis æquipolleant angu-
              <lb/>
            li cujuſlibet figuræ rectilineæ. </s>
            <s xml:id="echoid-s335" xml:space="preserve">Iam ſi cupio dignoſcere
              <lb/>
            quantitatem anguli figuræ æquilateræ & </s>
            <s xml:id="echoid-s336" xml:space="preserve">æquiangulæ,
              <lb/>
            diuidam numerum angulorum rectorum quos ea fi-
              <lb/>
            gura complectitur, per numerum laterum ipſius figu-
              <lb/>
            ræ. </s>
            <s xml:id="echoid-s337" xml:space="preserve">Exempli gratia, Triangulum ſeu Trianguli anguli
              <lb/>
            duobus rectis ſunt æquales, quos partiemur cũ tribus
              <lb/>
            angulis ſeu lateribus figuræ, prodibunt duæ tertiæ an-
              <lb/>
            guli recti: </s>
            <s xml:id="echoid-s338" xml:space="preserve">angulus igitur cujuſlibet Trianguli æquilate-
              <lb/>
            ri duabus tertiis anguli recti æquipollet. </s>
            <s xml:id="echoid-s339" xml:space="preserve">Secundò,
              <lb/>
            quadrilatera figura quatuor angulis rectis æquipollet:</s>
            <s xml:id="echoid-s340" xml:space="preserve"> </s>
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