Question: are all isosceles triangles 45 45 90?
Answer: 1. As an isosceles triangles, the length of 2 sides of any special 45 45 90 triangle will always be the same. ... As a consequence of having equal lengths, a corresponding property of these two sides is that they have angles of the same size. This can be identified by the two 4 5 45 45° angles in the diagram above.