"Equilateral" means having equal angles. So an equilateral triangle has all three angles the same size. "Equilateral" is the normal word for this, though you could say "equal-angled".
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I hope that you're not cheating on a quiz but an equilateral triangle can also be called a "regular" triangle.
A square also fits the definition of a rectangle (all angles are 90°), and a rhombus (all sides are equal length).
isoceles, equilateral, and scalene...
acute, isosceles right, obtuse, and equilateral
square