I hope that you're not cheating on a quiz but an equilateral triangle can also be called a "regular" triangle.
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"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".
A triangle is the same as a equilateral triangle because a equilateral triangle is a triangle but it is congruent on all sides
An oxymoron. An equilateral triangle cannot be obtuse; an obtuse triangle cannot be equilateral.
It's called an equilateral triangle.
An equilateral triangle is a triangle in which all three sides are equal. The yield sign on highways is an equilateral triangle.