An isosceles triangle therefore has both two equal sides and two equal angles. ... An equilateral triangle is therefore a special case of an isosceles triangle having not just two, but all three sides and angles equal.

Is every isosceles triangle equilateral?

Every equilateral triangle is also an isosceles triangle, so any two sides that are equal have equal opposite angles. Therefore, since all three sides of an equilateral triangle are equal, all three angles are equal, too.

Are all isosceles triangles equilateral yes or no?

An isosceles triangle is one with two equal sides. Therefore, every equilateral triangle is isosceles, but not every isosceles triangle is equilateral.