Compare and Describe Angles
10 min
Narrative
This Warm-up prompts students to compare four angles. When making comparisons, students have a reason to use language precisely (MP6). The activity also gives the teacher an opportunity to hear how students use terminology to talk about the characteristics of the angles in comparison to one another. This language will be important as students sort and order angles in the lesson activities. During the discussion, ask students to explain the meanings of any terms they use, such as “angle,” “ray,” “point,” “smaller,” “larger,” “flat,” “upside-down,” and so on.
Launch
- Groups of 2
- Display the image.
- “Pick 3 figures that go together. Be ready to share why they go together.”
- 1 minute: quiet think time
Teacher Instructions
- “Discuss your thinking with your partner.”
- 2–3 minutes: partner discussion
- Share and record responses.
Student Task
Which 3 go together?
Sample Response
Sample responses:
- A, B, and C go together because they look like square corners.
- A, B, and D go together because there’s a point where the rays meet.
- A, C, and D go together because one ray is horizontal.
- B, C, and D go together because they show arrows.
Activity Synthesis (Teacher Notes)
- “Do the images each show angles? How do you know?” (Each has two rays that share a starting point. The angle in A doesn’t show arrows, but the line segments are part of the rays that start at the vertex.)
Standards
- 4.G.1·Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures.
- 4.G.A.1·Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures.
- 4.MD.5·Recognize angles as geometric shapes that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement:
- 4.MD.C.5·Recognize angles as geometric shapes that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement:
20 min
15 min
Knowledge Components
All skills for this lesson
No KCs tagged for this lesson
Compare and Describe Angles
10 min
Narrative
This Warm-up prompts students to compare four angles. When making comparisons, students have a reason to use language precisely (MP6). The activity also gives the teacher an opportunity to hear how students use terminology to talk about the characteristics of the angles in comparison to one another. This language will be important as students sort and order angles in the lesson activities. During the discussion, ask students to explain the meanings of any terms they use, such as “angle,” “ray,” “point,” “smaller,” “larger,” “flat,” “upside-down,” and so on.
Launch
- Groups of 2
- Display the image.
- “Pick 3 figures that go together. Be ready to share why they go together.”
- 1 minute: quiet think time
Teacher Instructions
- “Discuss your thinking with your partner.”
- 2–3 minutes: partner discussion
- Share and record responses.
Student Task
Which 3 go together?
Sample Response
Sample responses:
- A, B, and C go together because they look like square corners.
- A, B, and D go together because there’s a point where the rays meet.
- A, C, and D go together because one ray is horizontal.
- B, C, and D go together because they show arrows.
Activity Synthesis (Teacher Notes)
- “Do the images each show angles? How do you know?” (Each has two rays that share a starting point. The angle in A doesn’t show arrows, but the line segments are part of the rays that start at the vertex.)
Standards
- 4.G.1·Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures.
- 4.G.A.1·Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures.
- 4.MD.5·Recognize angles as geometric shapes that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement:
- 4.MD.C.5·Recognize angles as geometric shapes that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement: