. Trigonometria. he dilbuice A B,and from the centers A and B,e let the arks B G^DandA F E be defer ibed, then (hall the legs A C and BC-bethe lines of the angles at A andaB:for they are the halvesof the fubtenfes A C £ and BCD. And therefore,As the fine of B, to A C, that is to the fi tie A C:So is the fine of A, to B C, that is, to the fine B C. Prop. 2. /» a re£la>igular Triangle, if from the angula* pointof either angle* and with the difianoe of either leg, a Periphery bedefcribed, either leg (hall be the Radius, the other leg a Tangent,andthe Hypotenufa {or fide fubt ending the right a
. Trigonometria. he dilbuice A B,and from the centers A and B,e let the arks B G^DandA F E be defer ibed, then (hall the legs A C and BC-bethe lines of the angles at A andaB:for they are the halvesof the fubtenfes A C £ and BCD. And therefore,As the fine of B, to A C, that is to the fi tie A C:So is the fine of A, to B C, that is, to the fine B C. Prop. 2. /» a re£la>igular Triangle, if from the angula* pointof either angle* and with the difianoe of either leg, a Periphery bedefcribed, either leg (hall be the Radius, the other leg a Tangent,andthe Hypotenufa {or fide fubt ending the right angle) a Secant, IN the rectangular triangle A C B, from the angular point B, and withchediftanceofthelcgBC, let the periphery DC be defcribed, thenfliall BC be the radius, AC a tangent, and AB afecant of thean-sleABC In lilce manner, if at the diftance A C, the periphery E C be defcribedfrom the angular point A, then fhall A C be the Radius, BCthe Tan-gent, and A B the fecant of the angle B A C. And therefore,.
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Keywords: ., bookcentury1600, bookdecade1650, bookidtrigonometri, bookyear1658
