A triangle with one right angle is called a

A triangle with one right angle is called a

• A. Isosceles triangle
• B. Equilateral triangle
• C. Acute triangle
• D. Right triangle

Answer: (D)

Triangles are categorized by their angles. If one angle measures 90 degrees, the triangle is called a right triangle. In a right triangle, the side opposite the 90-degree angle is the longest and is called the hypotenuse, while the other two sides are the legs. The other descriptions describe different ideas: equilateral means all three sides (and angles) are equal, isosceles means two sides are equal, and an acute triangle has all angles less than 90 degrees.

Triangles are categorized by their angles. If one angle measures 90 degrees, the triangle is called a right triangle. In a right triangle, the side opposite the 90-degree angle is the longest and is called the hypotenuse, while the other two sides are the legs. The other descriptions describe different ideas: equilateral means all three sides (and angles) are equal, isosceles means two sides are equal, and an acute triangle has all angles less than 90 degrees.