Question

which triangle has an obtuse angle?

Explanation:

Step1: Recall the definition of an obtuse angle

An obtuse angle is an angle that measures greater than \(90^{\circ}\) and less than \(180^{\circ}\).

Step2: Analyze each triangle

• First triangle: All angles appear to be less than \(90^{\circ}\) (acute triangle).
• Second triangle: One angle is greater than \(90^{\circ}\) (obtuse triangle).
• Third triangle: All angles appear to be less than \(90^{\circ}\) (acute triangle).
• Fourth triangle: All angles appear to be less than \(90^{\circ}\) (acute triangle).

Answer:

The second triangle.