They can be any size.
The only unchanging 'fact' which is true about all isosceles triangles is that two of them are equal.
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isosceles
You are an isosceles triangle that has two equal sides and two equal angles.
No because an isosceles triangle has various two congruent angles. A 45-45-90 triangle is technically an isosceles triangle.
that would be an isosceles triangle, although the def. of an isosceles triangle is: a triangle that has at least 2congruent sides.
In an isosceles triangle 2 sides are congruent and 2 angles are congruent. In an equilateral triangle all 3 sides are congruent and all 3 angles are congruent also.