Exterior Angle Sum Theorem

extI made this quick activity for students to discover the exterior angle sum. I just printed several quadrilaterals and pentagons, cut out the exterior angles, and put them mixed up in a Ziplock bag. I gave students 5 minutes to work with a team of 3 to somehow figure out what all the angles added to. I didn’t give them much direction beyond saying they needed to put the color edges together to discover it. Walking around the room, students kept calling me over to check their hypothesis as got really into it to be the first to figure out the theorem. It was a quick way to have students discover a simply topic rather than me just directly telling them…and it worked…two groups found it out in the 5 minutes!

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