. Trigonometria. . ; ■*■!■■■ I — ^ Summc of the half fumme and The fide A D , of the half fumme and diff. The fide D C inquired. Retaining the like thingsgiveny in the triangle of thefecond Scheam> I fay, \ Operation. As the fine of the half fumme of the angles To the fine of half the difference of the angle So the tang, of half the fide comprehended To tang, of the half difference of the other fides 2,9674 2 Operation. As the cofine of the half fumme of the angles the co
. Trigonometria. . ; ■*■!■■■ I — ^ Summc of the half fumme and The fide A D , of the half fumme and diff. The fide D C inquired. Retaining the like thingsgiveny in the triangle of thefecond Scheam> I fay, \ Operation. As the fine of the half fumme of the angles To the fine of half the difference of the angle So the tang, of half the fide comprehended To tang, of the half difference of the other fides 2,9674 2 Operation. As the cofine of the half fumme of the angles the cofine of half the difference So the tang, of half the fide comprehended 21. 07 3 3 , To tangent halt fumme of the fides difference of the fides Summe,halfe fumme,and half differ- 3 fumme and half differ- 2. The fide A D fide D C (fc^p From the famethings given, either of the otherfides, may be otherrvife found, by the 2 Prop, of the 2Chap. iAs in the tr>angle? ABE, Let ABC, Let The angle A B E *) f The ang. ABCThe angle A E B I Theang. A C BThefummeF 3 Summc HThe difference G , Differ. KThe bafe BE \The bafe B CHalfthebafeBE j [Half bafe BC Summe of the Difference 97-567 7-85* 2 For- % Ingonometria Britawiica, i For the fegmcnts B D and D Er As the fine of thefumme of the angles !F (520146 To the fine of the difference of. the angles G So Is the tangent of half BE the tangent of half BC Thefumisthe greater fegment B D M-999 The difference is the leffer fegment DE or D C Or if the perpendicular fall without, as in the triangle ABC,As the fine of the fumme of the angles H To the fine of the
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Keywords: ., bookcentury1600, bookdecade1650, bookidtrigonometri, bookyear1658
