TRIGONOMETRIE SPHERICE

54 ^

Dacis prasterang. rectum.

^uaer.i

11

BC'AC

C

T, BC:R: :T,C A : coS, C. SiBC fuerit major aut minor Qua-!drante , CA &.BA & proindeanguli erunt ejusdem aut diver-sae affectionis , sed datur speciesC A, ergo dabitur species anguliC.

Der z8

ZI

rz

BC B

AC

R : S,BC :: S,B:S, AC ejusdem{peciei cum B.

per Z9& 18

13

AC B

BC

S,B:S, AC: :R:S,BC ambigui.

per 2.9

14

BC AC

B

3 , B C : R :: S, A C: S, B ejuldem{peciei cum C A.

per 2.9

15

B C

B C

T, C : R:: coT, B: coS, B C. prout

anguli B & C ejusdem aut diversaeaffectionis fuerint, erit BC minoraut major quadrante.'

per 30

19 ZQ

i

16

1

BC C

B

R: coS, B C:: T, C: coT, B. proutBC fuerit minor aut major qua-drante; anguli C & B erunt ejus-dem aut diversae affectionis. Seddatur species anguli C. quare da-bitur species anguli B.

per 30

ZI

T

De Resolutione Triangulorum Recl angulorum Sphericorum,per quinque partes circulares.

. ir

P erpensis Analogiis, quibus Triangula Spherica Rectan-gula solvuntur, Dominus Neperus , nobilis ille Loga-rithmorum Inventor, duas excogitavit Regulas memo-ria facile retinendas, quarum ope omnes sedecim casus re-solvi possunt; Nam cum in hisce triangulis, praeter angulumrectura, sint tria latera & duo anguli, latera angulum rectum

com-