Question 253145
Isosceles means two sides and therefore two angles are equal.  You could have a right triangle that is 90 degrees, 45 degrees, and 45 degrees.  


However, if the triangle is equilateral, this means that ALL three sides and therefore ALL three angles are equal.  If all three angles are equal and total 180 degrees, they all have to be 60 degrees.  This is NOT a right triangle.


Dr. Robert J. Rapalje, Retired