Obliquangle

But if it be an obliquangle triangle, to note it with the letters BCD.

Notwithſtanding in obliquangle triangles, although the ſhankes are not the heights, the caulſe of the truth hereof is the ſame.

IN an obliquangle Triangle, when the termes propounded are two ſides and one Angle , or two Angles and one ſide, and yet the terme required undiſcoverable by the two laſt premiſed Problemes, you are to convert ſuch a Triangle into two Rectangle Triangles, […]

And here we may take in by the way, another kind of tetragonall Plane, very variable in reſpect of it's angles, but regular-like, (as I may term it) being equilaterall, though notequi-angular , called Rhombus, being the onely obliquangle equilaterall Parallelogram, and which therefore is a Quadrat, […]