A triangle that is not a right triangle.
Oblique Triangle
See also
Right Triangle, TriangleExplore with Wolfram|Alpha
References
Kern, W. F. and Bland, J. R. Solid Mensuration with Proofs, 2nd ed. New York: Wiley, p. 3, 1948.Referenced on Wolfram|Alpha
Oblique TriangleCite this as:
Weisstein, Eric W. "Oblique Triangle." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ObliqueTriangle.html