Answer: No
Explanation:
The properties of isosceles triangles are that 2 sides are equal in length, 2 angles are equal, and the angles add up to 180°.
A 45-45-90 triangle is isosceles because 45+45+90=180, and 45° and 45° are equal angles.
As long as 2 angles are the same and 3 total angles add up to 180°, then it is an isosceles triangle.
For example, 30-30-120 is an isosceles triangle because 30+30+120=180°. 30 and 30 are also equal angles.