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Home > MC2 > Chapter 5 > Lesson 5.3.1 > Problem 5-90

5-90.

Decide if these angles are acute, obtuse, or right angles. All diagrams are drawn to scale.

Acute angle: An angle with a measure between (but not including) and .
Right angle: An angle measuring .
Obtuse angle: An angle with a measure between (but not including) an .

To determine the type of angle, use a angle as a reference point.

  1. Since the angle is greater than , it is obtuse.

  1. Acute angle