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Home > CC4 > Chapter 1 > Lesson 1.1.3 > Problem 1-31

1-31.

Right angle imageEstimate the size of each angle below to the nearest 10°. A right angle is shown for reference so you should not need a protractor. Then classify each angle. Read the Math Notes box in this lesson if you need a reminder about angle classification. Homework Help ✎

≈ 100°
obtuse angle

≈ 170°
obtuse angle

≈ 45°
acute angle