Finding Classroom Angles

Featured image angles photo by Spencer Davis on Unsplash

By Marlee Bennett and Kasidy Honnaka

Standards: Draw and identify lines and angles, and classify shapes by properties of their lines and angles.

Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures.

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.

Target student group: 4th-grade math

The instructional goal of the lesson: Students will be able to identify angles in the real world.


Okay, mathematicians, please join us on the rug for math time! Today we will be reviewing our work on angles in the world. Let’s first watch this video!

Can everyone hold up your arms to show me an acute angle? Great! An acute angle is less than 90 degrees! Can you show me an obtuse angle? Yes! An obtuse is bigger than 90 degrees and smaller than 180 degrees. I am seeing lots of big arms! Finally, can you show me a 90 degree angle with your arms? Nicely done!

Not only do we see angles in math, we can also find them in the world around us!

To practice, please get into pairs for a scavenger hunt! I am going to share a Jamboard with you all and I want you to work with your partner to find examples of acute, obtuse, and right angles around the classroom. When you find one, take a picture of it, put it in the Jamboard in the correct category.

Click on the image to access the Jamboard.

Great job! I challenge you to find three more angles at home today and then tell me about them tomorrow!

This activity helps students identify and compare learning to real-world objects rather than just practicing on a worksheet. If the teacher/students wanted to take learning to the next step they could practice identifying the degree of each angle.

One Reply to “Finding Classroom Angles”

  1. Marlee and Kasidy, some pretty bad rap on the video. Grin. But it does get the principles across. I really like your idea of having student photograph and catalog examples of the angle on a Jamboard. A great way to demonstrate understanding.
    PS – Some videos (like the one you selected) don’t allow plays from embeds. So you might better just give a title and share a hyperlink to it.

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