Unit 7: Angles and Angle Measurement

Students learn to draw and identify points, rays, segments, angles, and lines, including parallel and perpendicular lines. They use a protractor to measure angles and identify acute, obtuse, right, and straight angles in two-dimensional figures.

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Unit

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Concept

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Practice

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Set 1

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Set 2

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Advanced

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What this unit covers

A Points, Lines, Segments, Rays, and Angles · 5 lessons

Goals

• Draw and identify points, lines, rays, segments, and parallel and intersecting lines in geometric figures.
• Recognize that angles are formed wherever two rays share the same starting point, and identify angles in two-dimensional figures.

Lessons

1. How Would You Describe These Figures?
2. Points, Lines, Rays, and Segments
3. Two or More Lines
4. Points and Lines All Around
5. What Is an Angle?

B The Size of an Angle · 6 lessons

Goals

• Recognize that angles can be measured in degrees and found, using addition and subtraction.
• Use a protractor to measure and draw angles, and recognize that perpendicular lines create 4 right angles.

Lessons

1. Compare and Describe Angles
2. The Size of an Angle on a Clock
3. The Size of An Angle, in Degrees
4. Use a Protractor to Measure Angles
5. Angle Measurement and Perpendicular Lines
6. Use a Protractor to Draw Angles

C Angle Analysis · 5 lessons

Goals

• Draw and identify acute, obtuse, right, and straight angles in two-dimensional figures.
• Write equations to represent angle relationships, and reason about and find unknown measurements.

Lessons

1. Types of Angles
2. Find Angle Measurements
3. Reasoning about Angles (Part 1)
4. Reasoning about Angles (Part 2)
5. Angles, Streets, and Steps (Optional)