Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines

Start lessonBegins with Classifying figures by lines and angles · Slides

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Lesson Plan →Objectives, pacing and practice, built from this lesson's brief.
Guided Notes →One page your students fill in and keep.
Exit Ticket →Three items at the end of class. No student accounts.
Re-teach →After an exit ticket: who missed what, and what to do tomorrow.
Homework →Assign practice; it grades itself.

4.G.A.2

**4.G.A.2**: Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles.

4.G.A.2: Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles.

What you'll learn

Classify two-dimensional figures based on the presence or absence of parallel lines (e.g., parallelogram has two pairs, trapezoid has exactly one pair, triangle has none)
Classify two-dimensional figures based on the presence or absence of perpendicular lines (e.g., rectangle has four pairs of perpendicular adjacent sides, rhombus may or may not)
Classify two-dimensional figures based on the presence or absence of angles of a specified size (right, acute, obtuse)
Recognize right triangles as a category and identify right triangles among a set of triangles
Use the properties of parallel lines, perpendicular lines, and angle types as the basis for classification -- not just the shape's name

Review first:

Draw points, lines, line segments, rays, angles, and perpendicular and parallel lines

Slides

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Classifying figures by lines and angles

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Practice

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Exercise

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