, 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,… … Sine of)fVhole fine of\Sine ofSine of AH. AH AI.A IHG.HMI L.IF 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…
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