What type of triangle has one angle measuring 90 degrees?

A triangle that has one angle measuring 90 degrees is classified as a right triangle. This specific type of triangle is defined by the presence of this right angle, which is exactly 90 degrees. The significance of the right angle distinguishes right triangles from other types, such as acute and obtuse triangles.

Acute triangles have all angles measuring less than 90 degrees, while obtuse triangles have one angle that exceeds 90 degrees. Scalene triangles are characterized by having all sides of differing lengths and can be further categorized into acute, right, or obtuse triangles, depending on their angles. However, the defining feature of a right triangle is the presence of that one right angle, making it uniquely identifiable among the different types of triangles. This clear definition is what confirms that the correct answer is indeed the right triangle.