- You will need Geoboards and rubberbands for this activity.
- Have students make any triangle they wish on the Geoboard, keeping one side parallel to the side of the Geoboard. This side will be called the Base.
- Students will then find the area of that triangle. The area is found assuming the following: The smallest square on the board equals one unit of area, and the side of that square is one unit of length.
- Have students do this for at least four other triangles, recording their data as they go.
- Ask students if they can find a pattern and devise a formula that will always work for any triangle. The point of this exercise is to see if the students can come up with the formula for the area of triangles, which is

A=(1/2)x(base)x(height). - If you want to give them a hint in finding the formula, tell students to make two of the same triangles and form them into a parallelogram.
- You may want to have your kids use this Geoboard pattern to show how they found the area.

- Record a Story
- "Thanksgiving" Poem
- Bumper Stickers
- Student Editorial
- Color Pastel Classmates
- Thumbprints
- Ten Black Dots
- The Pumpkin
- Patron Saint of Lovers
- Write the Words
- Where Did He Go?
- To Float or Not To Float
- Twelves
- Sequences
- Surf the World
- Take for Granted
- Cultural Comparison
- Distances Traveled
- Roses Are Pink, Your Feet Really Stink
- Discover Pi
- Combinations
- Line Symmetry
- Valentine Placemats
- Where Is This?
- Author Spotlight
- Paint a Picture with Words
- If You Could Be An Animal
- Valentine Flower Pots
- Does It Measure Up?
- U.S. Percentages
- Food For Thought
- Chalk Drawings
- Exaggeration In Stories
- Unifix Animals
- Paint by Title
- Walk a Mile in Their Boots
- Area and Perimeter of Olympic Rings
- Determining Density
- Olympic Rings
- The Color Mix-Up
- Leaf Estimation
- Pumpkin Measurements
- Election 2000
- Spin the Dreidel
- National Olympic Trends
- Krypto
- All About Columbus
- Time Capsule Diorama
- Still Life
- Number Relationships

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