A triangle with all three sides equal.

A triangle with all three sides equal.

• A. Product
• B. Divide
• C. Quadrilateral
• D. Equilateral Triangle

Answer: (D)

When a triangle has all three sides equal, it's called an equilateral triangle. This name directly matches the description, since equilateral means all sides are equal (and, in a triangle, that also means each interior angle is 60 degrees). The other terms don’t describe a triangle: a product is the result of multiplication, divide is an operation to separate into parts, and a quadrilateral is a four-sided polygon, not a triangle. So the best fit for a triangle with equal sides is equilateral triangle.

When a triangle has all three sides equal, it's called an equilateral triangle. This name directly matches the description, since equilateral means all sides are equal (and, in a triangle, that also means each interior angle is 60 degrees). The other terms don’t describe a triangle: a product is the result of multiplication, divide is an operation to separate into parts, and a quadrilateral is a four-sided polygon, not a triangle. So the best fit for a triangle with equal sides is equilateral triangle.