FTCE General Knowledge Math Practice Test

Which triangle has one right angle?

1. Obtuse triangle

2. Acute triangle

3. Right triangle

4. Equilateral triangle

The correct answer is: Right triangle

A triangle that has one right angle is known as a right triangle. In geometrical terms, a right triangle is defined specifically by the presence of a 90-degree angle, which is a right angle. This characteristic differentiates right triangles from other types of triangles, such as obtuse triangles, which contain one angle greater than 90 degrees, and acute triangles, in which all angles are less than 90 degrees. Furthermore, an equilateral triangle, which has three sides of equal length, has all three angles measuring 60 degrees and therefore does not contain a right angle. Recognizing these properties allows you to correctly identify the triangle with one right angle as a right triangle.