. Trigonometria. Jfegment DC B, $ The angle A C D inquired. tn 88 Trigonometria Brkannica. In the triangle of the inferiour Scheam. As the Radius DS 90To the tangent of S O 4^.3020 So the co-fine of CD ■2 5 3 3 To the tangent of T P 37-808? Complement is TV= LI 52*1915 2 Operation. As the tangent of the fide AB=FM3© *143937 To the tangent of the fide DC=LG So the co-fine of L I, v*x. IR 2 1 ■.■• To the co-fine of IF,f/*.. I j£. 71-9197 Therefore the arch IF
. Trigonometria. Jfegment DC B, $ The angle A C D inquired. tn 88 Trigonometria Brkannica. In the triangle of the inferiour Scheam. As the Radius DS 90To the tangent of S O 4^.3020 So the co-fine of CD ■2 5 3 3 To the tangent of T P 37-808? Complement is TV= LI 52*1915 2 Operation. As the tangent of the fide AB=FM3© *143937 To the tangent of the fide DC=LG So the co-fine of L I, v*x. IR 2 1 ■.■• To the co-fine of IF,f/*.. I j£. 71-9197 Therefore the arch IF But the arch found is IL The difference is F L ^9-98271035 the meafure of the ang. DC Ac PROBL. 9. Two angles and a fide oppofite to either of them given, to finde the other angle, If it be known, whe-ther the angle inquired, or the fide oppofite to the other angle given, be more or lefle t Uena Quadrant. In the Obliquangular triangle ADC, the angle A C D is The given 1 Sttper. Scbeam. CD AC ; fADC ( Side AC 30 2 Infer. lC The terms of proportion. 1 For the fegment of the vertical angle, by the 6 Trobl. A s the Radius^To thecojine of the Hypotenufa So the ta ngent of the angle at the bafetTo the co-tangent of the firJt vertical angle. 2 For the fecond vertical angle, c»nfeU. 4. As the co fine of the angle at the bafeyTo the co fine of the other angle given : So the fine of the flrfi vertical the fine of the fecond vertical angle. If the perpendicular fall within the triangle, the fum ;if without, the difference of the vertical angle is the angleinquired. Illttftration ^Arithmetical. * As the Radius A S 90. To the tangent of S O So the cofine of A C, *;*. AT 60To the tangent TP 3 ©27 1 Operation Trigmwmetrid Brhminica. 2 Oper at ion. ■ As the co-fine of G To the co-fine ofNM, t/^.H M 4^.6
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Keywords: ., bookcentury1600, bookdecade1650, bookidtrigonometri, bookyear1658
