How many degrees does a right triangle contain at least?

A right triangle is defined by one of its angles being exactly 90 degrees. This characteristic is what distinguishes it from other types of triangles. The sum of all angles in any triangle must equal 180 degrees. Therefore, in a right triangle, with one angle being 90 degrees, the other two angles must add up to 90 degrees as well. This means that a right triangle inherently contains and must include an angle measuring exactly 90 degrees, making this option the most accurate description of the triangle's properties.

The other descriptions do not accurately reflect the nature of a right triangle. One of the defining traits of a right triangle is its 90-degree angle, aligning precisely with the correct answer.