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Grade 4geometryOriginal practice

Geometry: Measuring and Classifying Angles

Read protractors and classify acute, right, and obtuse angles with structured practice.

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Grade 4 · math

Geometry: Measuring and Classifying Angles

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Grade 4 · math · continued

Geometry: Measuring and Classifying Angles

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Read each protractor from its zero-degree baseline, or classify the angle as acute, right, or obtuse.

1.Read the protractor. Ray OA starts at 0° on the right. What is the angle?

A125°

B50°

C135°

D130°

2.Classify an angle measuring 100°.

AAcute

BObtuse

CStraight

DRight

3.Read the protractor. Ray OA starts at 0° on the right. What is the angle?

A100°

B80°

C85°

D75°

4.Classify an angle measuring 100°.

AStraight

BRight

CAcute

DObtuse

5.Read the protractor. Ray OA starts at 0° on the right. What is the angle?

A70°

B75°

C110°

D65°

6.Classify an angle measuring 10°.

AAcute

BRight

CStraight

DObtuse

Grade 4 · math · Answer key

Geometry: Measuring and Classifying Angles

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Grade 4 · math · Answer key · continued

Geometry: Measuring and Classifying Angles

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Read each protractor from its zero-degree baseline, or classify the angle as acute, right, or obtuse.

1.Read the protractor. Ray OA starts at 0° on the right. What is the angle?

D. 130°

Start at the right-hand 0° baseline and read toward ray OB: 130°.

2.Classify an angle measuring 100°.

B. Obtuse

Acute angles are less than 90°, right angles equal 90°, and obtuse angles are between 90° and 180°. This angle is obtuse.

3.Read the protractor. Ray OA starts at 0° on the right. What is the angle?

B. 80°

Start at the right-hand 0° baseline and read toward ray OB: 80°.

4.Classify an angle measuring 100°.

D. Obtuse

Acute angles are less than 90°, right angles equal 90°, and obtuse angles are between 90° and 180°. This angle is obtuse.

5.Read the protractor. Ray OA starts at 0° on the right. What is the angle?

A. 70°

Start at the right-hand 0° baseline and read toward ray OB: 70°.

6.Classify an angle measuring 10°.

A. Acute

Acute angles are less than 90°, right angles equal 90°, and obtuse angles are between 90° and 180°. This angle is acute.