Clavius, Christoph, Geometria practica

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194164GEOMETR. PRACT. quæad huncnumerum 9 {547/1208}. reducetur, ſi numerator per denominatorem
diuidatur
:
atque tanta eſt fermè perpendicularis DC, nimirum 9 {547/1208}. Sic et-
iam
ſi differentia 2 {3/8}.
inter ſegmentum B C, 17 {5/8}. & latus B D, 20. multiplice-
tur
per 37 {5/8}.
ſummam eiuſdem ſegmenti B C, & latus B D: gignetur idem
numerus
, qui prius, {5719/64}.
hoc eſt, 89 {23/64}. cuius radix quadrata paulo ma-
ior
eſt, quam 9 {547/1208}.
velutiprius. Atque hęcratio ſatis expedita eſt.
In triangulo verò poſteriori A B D, ſi quadratum 31 {45/64}. ſegmenti AC, 5 {5/8}.
ſubtrahatur ex 121. quadrato lateris adiacentis A D, 11. remanebit quadratum
89
{23/64}.
perpendicularis DC, cuius radix eſt paulò maior quam 9 {547/1208}. vt ſupra.
22Quæ via in-
ueſtigandæ

perpendicu-
laris
ſit expe-
ditior
.
Sic etiam ſi quadratum 310 {41/64}.
ſegmenti B C, 17 {5/8}. ſubtrahatur à quadrato 400.
lateris adiacentis B D, 20. remanebitrurſus quadratum 89 {23/64}. perpendicularis
DC
, cuiusradix paulo maior eſt quam 9 {547/1208}.
vt ſupra. Verum priorratio ma-
gis
expedita videtur, quanquam alij poſteri@rem hanc viam tradant.
Itaqve ſi in priori triangulo A B C, perpendicularis A D, 8. ducatur in
44Area prioris
trianguli

ABC
.
10 {1/2}.
ſemiſem baſis BC, vel 4. ſemiſsis perpendicularis AD, in 21. totam baſem,
procreabitur
area trianguli ABC, 84.
Quę etiam producetur, ſi tota perpendi-
culari@
8.
in totam baſem 21. multiplicetur, & producti numeri 168. ſemiſsis ac-
cipi@tur
84.

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