. Trigonometria. C O N S E C T A I^T II. If two perpendiculars fubtend equal angles. The fines of the perpendiculars are proportional to the/ines of the Hypoteuufaes, and the contrary, Let the angles C A E, B A D, be equal, becaufe ver-tical, which let be fubtended by the perpendicularsC E, B D drawn from their poles L and M. I fay thatthe fines of the perpendiculars C E, B D are propor-tional to the fines of the Hypotenufaes C A, B A, andcontrary : For the fine of the angle SAN, that Isof the ark S N, is equal to the fine of the angle O A P>that is of the ark OP. Therefore,

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