All isosceles triangles are equilateral.
a. true
b. false

To answer your question, let's first break down the question in its most simplest terms:

• Isosceles triangle: A triangle that has (at least) two equal sides.

• Equilateral triangle: A triangle on which all of its sides are equal.

- Therefore, an equilateral triangle is a special case of an isosceles triangle having not just two, but all three sides and angles equal.

- Therefore, all isosceles triangles are NOT equilateral.
• However, all equaliteral triangles are isosceles.