Module 4 Lessons:

Topic A: Lines and Angles

• Lesson 1: Identify and draw points, lines, line segments, rays, and angles. Recognize them in various contexts and familiar figures.

• Lesson 2: Use right angles to determine whether angles are equal to, greater than, or less than right angles. Draw right, obtuse, and acute angles.

• Lesson 3: Identify, define, and draw perpendicular lines.

• Lesson 4: Identify, define, and draw parallel lines. 

Topic B: Angle Measurement.

• Lesson 5: Use a circular protractor to understand a 1-degree angle as 1 360 of a turn. Explore benchmark angles using the protractor.

• Lesson 6: Use varied protractors to distinguish angle measure from length measurement.

• Lesson 7: Measure and draw angles. Sketch given angle measures, and verify with a protractor.

• Lesson 8: Identify and measure angles as turns and recognize them in various contexts. 

Topic C: Problem Solving with the Addition of Angle Measures

• Lesson 9: Decompose angles using pattern blocks.

• Lessons 10–11: Use the addition of adjacent angle measures to solve problems using a symbol for the unknown angle measure. 

• Lessons 11: Use the addition of adjacent angle measures to solve problems using a symbol for the unknown angle measure. 

Topic D: Two-Dimensional Figures and Symmetry

• Lesson 12: Recognize lines of symmetry for given two-dimensional figures. Identify line-symmetric figures, and draw lines of symmetry.

• Lesson 13: Analyze and classify triangles based on side length, angle measure, or both.

• Lesson 14: Define and construct triangles from given criteria. Explore symmetry in triangles.

• Lesson 15: Classify quadrilaterals based on parallel and perpendicular lines and the presence or absence of angles of a specified size.

• Lesson 16: Reason about attributes to construct quadrilaterals on square or triangular grid paper.