Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica
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circumferentiæ portio deſcribatur quæ capiat angulum ipſi
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B F A æqualem. </
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B C. </
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ita ut ſit angulus B A N angulo B F A vel B E A æqualis.
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proinde iſoſceles quoque. </
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tia deſcribatur quæ capiat angulum B F A, ea continget
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latus F A in A puncto. </
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nam quadratum A G majus eſt quadrato A N vel A B, cum
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ſit æquale quadratis ex K & </
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triangulum iſoſcelem B A N. </
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& </
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A B: </
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B G minus duplo rectangulo G B L, hoc eſt, minus rectan-
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K ad rectangulum G N, B E, hoc eſt, rectangulum G B E
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minùs rectangulo N B E. </
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quale rectang. </
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gulum ad B communem, & </
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quia propter triangulos ſimiles eſt N B ad B A ut A B ad
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B E. </
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lum C B D minùs quadrato A B. </
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C B D minùs quadr. </
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