Exercise 33 Page 250

To classify the triangle by its sides, we need to know how many sides are congruent.

Note that there are markers on two sides. They indicate that these sides are congruent. Therefore, the triangle is isosceles. Now let's look at the angles.

Since the angle between the congruent sides is obtuse, we can classify the triangle as an obtuse triangle. Therefore, we can classify the triangle as an obtuse isosceles triangle.