Which triangle has two sides equal?

Which triangle has two sides equal?

• A. Isosceles
• B. Scalene
• C. Equilateral
• D. Right

Answer: (A)

Two sides having the same length defines an isosceles triangle. When two sides are equal, the triangle has a base with two equal sides called the legs, and the angles opposite those equal sides are also equal. If all three sides are equal, the triangle is equilateral, not just two sides equal. If no sides are equal, it’s scalene. The term right describes a 90-degree angle, which can occur in various side-length patterns, but the condition of two equal sides specifically points to an isosceles triangle.

Two sides having the same length defines an isosceles triangle. When two sides are equal, the triangle has a base with two equal sides called the legs, and the angles opposite those equal sides are also equal. If all three sides are equal, the triangle is equilateral, not just two sides equal. If no sides are equal, it’s scalene. The term right describes a 90-degree angle, which can occur in various side-length patterns, but the condition of two equal sides specifically points to an isosceles triangle.