Final answer:
A triangle with one angle measuring 28° and another angle measuring 89° is an obtuse triangle.
Step-by-step explanation:
A triangle with one angle measuring 28° and another angle measuring 89° is an obtuse triangle. In an obtuse triangle, one of the angles is greater than 90°. Since the given triangle has an angle of 89°, which is greater than 90°, it is an obtuse triangle.