. Trigonometria. A G And the contrary. *^C Sine of the HypotenufagJSteof g SSine of the Hypotenufa%LSiveof CA HIB AFG CO N S EC T A RY IV- in Obliquangnlar triangles; if a perpendicular be drawn from the vertical angle to the op-pofitefide, (continued if need be;) • The fines complements of the angles at the Bafe are direftly proportionalto the fines of the vertical angles;and contrary. In the obliquangnlar triangle A BD , fromthe top thereof A, let fall the perpendicular AC; and continuing the fides B A, DA, toge-ther with the perpendicular A C unto Qua-drants, viz,. A L, A F ■• I; from the t
. Trigonometria. A G And the contrary. *^C Sine of the HypotenufagJSteof g SSine of the Hypotenufa%LSiveof CA HIB AFG CO N S EC T A RY IV- in Obliquangnlar triangles; if a perpendicular be drawn from the vertical angle to the op-pofitefide, (continued if need be;) • The fines complements of the angles at the Bafe are direftly proportionalto the fines of the vertical angles;and contrary. In the obliquangnlar triangle A BD , fromthe top thereof A, let fall the perpendicular AC; and continuing the fides B A, DA, toge-ther with the perpendicular A C unto Qua-drants, viz,. A L, A F ■• I; from the topthereof A, defcribe the periphery IF L, themealurc of the vertical angles IA F , IA L,which are equal to the angles B \ C, D A CtAnd from the angular point* B and D, let theQuadrantalarcks be drawn HGE, HMN. Ifay that the fines of the arcks H G, HM, (the complements of the angles at the Bafe A D B, ABC) are dire&Iy proportional to the fines of t he vertical angles L I, FI: for by the 1 confe& Sine of)fVhole fine of\Sine ofSine of AH. AH Therefore, £3 J Sine ofO I Sine ofg C Sine ofStSineof HG? HM5 , j L^and contrary. CONSECTARY V. In obliquangular triangles; if a perpendicular be drawn from the vertical angle to the op-pofite fide, (continued if need be;) The fines complements of the ferments of the Bafe are direlly proportional to the fines complements of thefides of the vertical angles^and contrary. In Trhonometria Bntanmca. c> In the obliquangular triangle AB D, from the top thereof A , letfall the perpendicular A C upon the BafeDB, which together withthe fides, let be continued unto quadrants. I fay that the fines comple-ments of the fegments o{ the Bafe CN, C E, are proportional to thefines complements of the fides AM, AG. For by the i Confeftary, ^f Sine ofO \ Sine ofO \Sioeofg- {Sine of >3 (Whole fineSine ofSine of j* {Sine of o O Therefore, CN. ^ P And contrary,AG. \ ^ (Sine ofSine ofSine of q-{Sine of co AM. CN.
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Keywords: ., bookcentury1600, bookdecade1650, bookidtrigonometri, bookyear1658
