Posts tagged 'obtuse-angled-triangle'
G.78 right, obtuse, and acute-angled triangles
A right-angled triangle has a right angle, an obtuse-angled triangle has an obtuse angle, and an acute-angled triangle has three acute angles.
G.94 law of cosines for obtuse triangles
In obtuse-angled triangles, the square on the side subtending the obtuse angle is greater than the sum of the squares on the sides containing the obtuse angle by twice the rectangle contained by one of those sides and the projection of the other upon it.