In this activity, students build a device that allows them to classify angles as acute, obtuse, right, straight and reflex, and estimate their measures using "landmark angles." The template can be cut out and assembled in about 8 minutes using scissors, glue stick, a hole puncher and a paper fastener. I've included step-by-step photographic instructions on how to cut out and assemble the device.
Included in this activity is a set of 12 angle classification and estimation "clue cards" which students can answer solo or in pairs. An answer sheet for students, as well as an answer key for teachers is included.
Finally, there are suggestions for activity extensions that will help students remember the names of the different types of angles (as well as teach you, the teacher, about an angle you've never heard of before!)
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