Question

classify the triangle by its angles.
4.
100°
40°
40°

Explanation:

Step1: Recall triangle - angle classification rules

A triangle is classified by its angles. An acute triangle has all angles less than \(90^{\circ}\). A right - triangle has one angle equal to \(90^{\circ}\). An obtuse triangle has one angle greater than \(90^{\circ}\).

Step2: Analyze the given angles

The given angles of the triangle are \(100^{\circ}\), \(40^{\circ}\), and \(40^{\circ}\). Since \(100^{\circ}>90^{\circ}\)

Answer:

The triangle is an obtuse triangle.