Interior Angles of Triangles and Quadrilaterals

We started our lesson by taking down notes in our interactive foldable graphic organizer. I project the notes on the overhead screen for them to copy. I then put a printed copy of the poster on my bulletin board.

Next I gave them this sheet of triangles and quadrilaterals and they colored in each of the corners.

The next step was to prove that the interior angles of a triangle were 180 degrees and 360 degrees for a quadrilateral.  The students tear of the corners of the shapes and put them together to form 180 or 360 degree combined angles, thus proving the angle sum theorem.

You can find this product in my TpT store here:


  1. And this is why I teach the little kiddos lol Thanks for linking up!!!

    Mrs. Stanford's Class

  2. I came over from the Hump Day Blog Hop!
    Your post is terrific, I can't wait for next week.
    I'm your newest Blog Lovin' follower!
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  3. Hey, Amy! Great post! Your classroom looks great!