Unit 7, Lesson 6
Comparemos y describamos ángulos
Grado 4
Preparation
Lesson Narrative
In previous lessons, students identified and described lines, line segments, rays, and angles in geometric and real-world contexts. The purpose of the exploratory work in this lesson is for students to make sense of which attributes define an angle (rays at a common starting point) and which attributes do not (lengths of the line segments). The activities in the lesson intentionally elicit students’ ideas for how to describe an angle’s size.
Throughout the lesson, monitor for the ways students distinguish visible line segments from the rays that compose the angles, and the language they use to describe the size of an angle.
- Compare and contrast (orally and in writing) angles.
- Pensemos en cómo comparar y describir ángulos.
Required Materials
Required Preparation
- Create one set of cards from the blackline master for each group of 2 students.
Teacher Reflection Questions
In today’s lesson, students had the opportunity to compare angles, using the language that makes sense to them. What language did they use to describe the size of an angle? How can you build on this language in the next lesson when the size of an angle is described as a turn of one ray from the other?