Question

1. classify by side and angle.

Explanation:

Step1: Analyze sides

Two sides are 2.5, so it's isosceles (two equal sides).

Step2: Analyze angles

One angle is \(128^\circ\) (obtuse, greater than \(90^\circ\)), and two angles are \(26^\circ\) (acute). So angle - wise, it's obtuse.

Answer:

By side: Isosceles triangle (two sides of length 2.5 are equal). By angle: Obtuse triangle (has one angle \(128^\circ\) which is obtuse). So the triangle is an isosceles obtuse triangle.