FTCE Professional Education Practice Exam

In which triangle type would you find at least one angle greater than 90 degrees?

1. Acute triangle

2. Obtuse triangle

3. Right triangle

4. Equilateral triangle

The correct answer is: Obtuse triangle

An obtuse triangle is characterized by having one angle that exceeds 90 degrees. This distinct property sets it apart from other triangle types. In contrast, an acute triangle contains all angles measuring less than 90 degrees, while a right triangle has exactly one angle that equals 90 degrees. An equilateral triangle, on the other hand, has three angles all measuring exactly 60 degrees, thus remaining acute as well. Therefore, the definition of an obtuse triangle clearly encompasses the criterion specified in the question, making it the correct choice.