- Mathematicians sometimes say that A is an arbitrary isosceles triangle, but all they mean is that A could be any such triangle.
- The base of the wedge is an isosceles right triangle in a vertical plane.
- This is the ‘alternate’ solution to constructing the isosceles triangle with the base of the square as one side, using only a straightedge.
- First construct an isosceles triangle whose base angles are double the vertex angle.
- The base angles of an isosceles triangle are equal.