- 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.

- Surf the World
- Crooked vs. Straight
- Travel Brochure
- Count Pine Cone Scales
- Unscramble the Words
- Bean Bag Throw-and-Catch
- Building Our Community
- "A Busy Year" Reading
- The Heart of the Matter
- Rhyming Match
- Discover the Explorers
- Sequences
- Original Nature Tales
- The First Thanksgiving
- Turkey Math
- Cultural Comparison
- Monster Math
- Combinations
- Money Del Mundo
- If I Were President...
- Block Volume
- Area of a Shamrock
- What Weighs More?
- Am I a Square?
- Distances Traveled
- Round vs. Flat
- Story Problems
- "Thanksgiving" Poem
- Picture Poems
- Tri-Angles
- Height of a Tree
- Rebus Stories
- Student Editorial
- Base10 Blocks
- Food From Around the World
- Dough Dreidel
- What Do I Want to Know?
- Discover Music
- What’s My Name Worth?
- Sand Painting
- Write the Words
- Hero or Not?
- Popping Popcorn
- U.S. Percentages
- How Many Squares?
- What’s the Stamp Worth?
- Inclined to Slide
- Patron Saint of Lovers
- Picture Frames
- Puppets

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