No.
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A right angle triangle with 45, 45 and 90 degree angles is similar to an isosceles triangle
no
Never
isosceles triangle
An equilateral triangle is a triangle with three equal sides. An isosceles triangle is one with two equal sides. So yes, an equilateral triangle qualifies as being an isosceles triangle as well. This is quite similar to the relationship between squares and rectangles, where a square is always a rectangle, but a rectangle isn't necessarily a square.