...angled. Triangles, by adding a right angled Triangle to it. In letting fall the Perpendicular, let it fall from the End of a given Side, and oppofite to a given Angle ; and if the three Things given be adjoining to one another, let it alfo fall from the End of the Side...

...by letting fall a Perpendicular, and working it as two Right-angled ones, only obferve to Let your Perpendicular fall from the End of a given Side, and oppofite to a given Angle, which when done, all the twelve Cafes in Oblique may be performed by thefe Rules, and the following...

...^ЪСЛг. Cotan. В С : Cotan. ЛС. Note, In fettrag fall a Perpendicu-lar, always obferve to let it fall from the End of a given Side, and oppofite to a given or known Angle ; and if the three Things given ftand together, kt k fall from the End of a required...