Vt ſinus anguli BAD, dif- \\ ferentiæ inter angulos com \\ plementorum angulorum \\ obſeruationum # ad B D, diffe- \\ rentiam ſta- \\ tionum: # Ita ſinus anguli ADB, con- \\ flati ex recto B D E, & \\ ex angulo obſeruationis \\ A D E, in propinquiore \\ ſtatione # ad AB di- \\ ſtantiam \\ quæſitã.
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</note>
<p>
<s xml:id="echoid-s2629" xml:space="preserve">cognita erit diſtantia A B, quam quærimus, in partibus differentiæ ſtatio-
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num B D.</s>
<s xml:id="echoid-s2630" xml:space="preserve"/>
</p>
<p>
<s xml:id="echoid-s2631" xml:space="preserve">
<emph style="sc">Qvod</emph>
ſi oculus ponatur in D, & </s>
<s xml:id="echoid-s2632" xml:space="preserve">recedatur à puncto D, vſque ad B, repe-
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rietur eodem modo diſtantia DA, ſi pro angulo BDA, aſſumes angulum DBA,
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complementianguli ABC, obſeruationis in remotiore ſtatione, vt manifeſtum
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eſt. </s>
<s xml:id="echoid-s2633" xml:space="preserve"> Nam eſt, vt ſinus anguli BAD, differentiæ inter angulos