. Trigonometria. Scheam. 2 Infer. Scheam C rDC A ^ ] The given < Angles^ Q £ ^DAC 3^.T3i2rj Side AC 30 jC 4--H66 The term s ofj proportion. 1 For the fegment of the vertical angle, hj the 6 Trebl. %C As the Radius,&)To the co-fine of the Hy potenuft:Qj So the tang, of the angle at the bafe^%lfTo the fegment ofthefirfi vertical ang. [ ^ 2 For the angle inquired) by the fourth Confetc. As the fine of the fir ft fegment of the vertical angle %ro the fine of the fegment of the vertical angle :So the co-fine of the angle at the bafey9.£To the Co-fine of th
. Trigonometria. Scheam. 2 Infer. Scheam C rDC A ^ ] The given < Angles^ Q £ ^DAC 3^.T3i2rj Side AC 30 jC 4--H66 The term s ofj proportion. 1 For the fegment of the vertical angle, hj the 6 Trebl. %C As the Radius,&)To the co-fine of the Hy potenuft:Qj So the tang, of the angle at the bafe^%lfTo the fegment ofthefirfi vertical ang. [ ^ 2 For the angle inquired) by the fourth Confetc. As the fine of the fir ft fegment of the vertical angle %ro the fine of the fegment of the vertical angle :So the co-fine of the angle at the bafey9.£To the Co-fine of the angle inquired. If the perpendicular fall within, the arch found ; Ifwithout, the complement of the arch laft found to a fe-micircle, is the angle inquired. Illttfiration Arithmetical. As the Radius A S 9© © To the tangent of SO So the co-fine of C A T 60 993753063 To the tangent of TP The complement is T V=I L , the meafure of the angle A C ^8811 2 Operation, Asthefineof IL 57*6973 To the fine of IF So the cofine of E G, G 5 ■ To the cofine of M N, viz,. H M Therefore the angle ADC 020, the angle inquired. The fame Prtxft is required in the triangle of the Infer. Scheme* I Operation, As the 90 To the tangent of SO So the cofine of AC, v/«. A To the tangent of TP $.889815x1 Complement is T V==I JL 1 Oper*ti$» Tmonometria Britannic To the fine of IF ? So the cofine of EG viz,.HG To the co-fine of MN,^.HM 00 ^ To which adding a QuadrantTheir aggregate is H X 10 h the meafure of the angle ADC Or if the arch H M 3 Be fubtra&ed from a quadrant 90 Or the arch H N- There (hall remain the arch MN the meafure of the angle
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Keywords: ., bookcentury1600, bookdecade1650, bookidtrigonometri, bookyear1658
