Full text: Volumen secundum. Opera geometrica. Opera astronomica. Varia de optica. (2)

GEOMET. VARIA. que {{1/4}ggoo/pp}, invenitur y = l - {nx/z} + √- mm + ox + {ppxx/gg}
Eademque eſt demonſtrandi ratio in caſu quarto, & aliis
quibusvis, habita ratione ſignorum + & -.

120.1.

fig. 7.

Cum non habetur {nx/z} in æquatione, puncta M & V unum
ſunt, tunc vero ſi p = g, hoc eſt ſi habeatur + xx pro
{ppxx/gg}, erunt ſemper aſymptoti ſibi mutuò ad angulos rectos,
quia ut p ad g, ita fecimus {1/2}o ad I X & ad I Y, & ita IX
ad I V; fiunt enim jam æquales I X, I Y, I V, & ſingulæ =
{1/2}o, unde punctum V eſt in ſemicirculo ſuper X Y & proin-
de angulus X V Y rectus. Item quia I M = {{1/2}aogg/zpp}, patet
quod ſi ag = zp, hoc eſt ſi g ad p ut z ad a, tunc erit
I M = {{1/2}og/p}, ac proinde æqualis ipſi IX & IY quæ etiam erant
{{1/2}og/p}. Adeoque hoc caſu erunt aſymptoti ſibi mutuo ad angu-
los rectos; cum rurſus punctum M ſit futurum in circumfe-
rentia circuli deſcripti ſuper X Y centro I.

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