- 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.

- Base10 Blocks
- Write the Words
- Picture Poems
- Hackey Sack
- Create an Instrument
- Bumper Stickers
- Sand Separation
- Word Association
- Broken Ruler
- Matching Animals To Their Names
- Bring Your Own Tale
- Election 2000
- Grateful for Acrostic
- Discovering the Area of Triangles
- How Much is 2000, Anyway?
- Rhyming Match
- Seasons
- Guided by the Stars
- The Medal Winners
- Discover Music
- Sand Painting
- Egg Weight
- Where Is This?
- Personal vs. Country Pride
- Celsius versus Fahrenheit
- The Real Reason
- How Far is Sydney?
- Volume Conversions
- Columbus Portraits
- All Kinds of Genres
- Walk a Mile in Their Boots
- Toothpick Sculptures
- Paint by Title
- Irish Mobiles
- European vs. Taino
- Person, Place, or Thing?
- Original Nature Tales
- All About Easter
- Haikon Mosaics
- Halloween Word Search
- Money Del Mundo
- Spaghetti vs. Macaroni
- Current Happenings in Science
- What Do I Want to Know?
- Alphabetizing Mania!
- Jacks
- Traditional Pumpkin Pie
- Compare Hair
- What’s Your Valentine Worth?
- Millennium Inventions

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