- Have your students figure out the sum of the angles of a rectangle. Give them this reproducible that explains why the angles of a four-sided figure will always add up to 360 degrees.
- Based on this reasoning, have your students figure out the sum of angles of other shapes, i.e. pentagon, hexagon, dodecahedron.
- These shapes are all regular shapes--the interior angles are equal and the lengths of the sides are equal. As your students experiment with figures that have unequal angles/sides, they will realize that all four-sided figures have interior angles that sum to 360 degrees. Likewise, all eight-sided figures have interior angles that add up to 1080 degrees.
- In order to help your students prove this, have them measure the angles of a 5-pointed star using a protractor. Download a five-pointed star here. They should add up the angles (10 of them); the sum will be 1440. You may want to have them continue doing this with other shapes to further their understanding.
- This download should be helpful for this activity. It is a list of shapes, from 4-sided to 12-sided, and the sum of their angles.

- Division with Models
- Discover Music
- Bumper Stickers
- Money from Around the World
- Tall Tales
- Pocket Chart
- How Many Classrooms Fit?
- All About Columbus
- Paint a Picture with Words
- Broken Ruler
- Compare the Cookies
- Combinations
- Volume Conversions
- Flannel Board Phonics
- Historical Perspective
- Cinquain
- Thingamajigs
- Decorative Vase
- Turkey Math
- If the Earth Were Flat
- Columbus Portraits
- Toothpick Sculptures
- Martin Luther King Jr.
- Scariest Jack-O-Lantern Contest
- Tri-Angles
- Historical Trivia
- Love Songs
- Columbus Acrostic
- Crossword Trivia
- Does Warm Water Rise Too?
- Building Our Community
- Potato Latkes
- Patron Saint of Lovers
- Olympic Rings
- Washer Weights
- Picture Frames
- Roses Are Pink, Your Feet Really Stink
- String Art
- The Mayflower Voyage
- Ice Insulation
- Height of a Tree
- Unifix Animals
- Where Is This?
- Number Relationships
- Area and Perimeter of Olympic Rings
- What’s My Name Worth?
- Letter to an Author
- Pumpkin Volumes
- European vs. Taino
- Speech Writing

© 2019 Innovative Classroom