Geodesic+Dome

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 * [[image:http://www.pbs.org/wgbh/buildingbig/images/one_px.gif width="45" height="1" caption=" "]] |||| [[image:http://www.pbs.org/wgbh/buildingbig/educator/images/header/activitygeodesic.gif width="389" height="19" caption="Activity: Geodesic Dome"]]

A geodesic dome is a dome formed by joining triangles together. You can build a giant geodesic dome out of newspaper. First, gather some friends or family members to help you.
 * What's the strongest dome you can build out of newspaper?**

• many newspapers • masking tape • measuring tape
 * What You Will Need**

Predict what type of triangles will form your dome and how many of each..
 * Make a Prediction**

1. Stack three flat sheets of newspaper together. Starting in one corner, roll the sheets up together as tightly as you can to form a tube. When you reach the other corner, tape the tube to keep it from unrolling. Repeat until you have 65 tubes.
 * Try It Out**

2. Now cut down the tubes to make 35 "longs" and 30 "shorts." Longs: Cut off both ends of a tube until it is 71 centimeters long. Use this tube as a model to create 34 more longs. Be sure to mark all the longs clearly in some way, such as with colored tape, so you can tell them apart from the shorts. Decorate the tubes if you like. Shorts: Cut off both ends of another tube until it is 66 cm long. Use this tube as a model to create 29 more shorts.

3. First, tape 10 longs together to make the base of the dome.

4. Tape a long and a short to each joint. Arrange them so that there are two longs next to each other, followed by two shorts, and so on, as shown.

5. Tape the tops of two adjacent shorts together to make a triangle. Tape the next two longs together, and so on all the way around.

6. Connect the tops of these new triangles with a row of shorts. (The dome will start curving inward.)

7. At each joint where four shorts come together, tape another short sticking straight up. Connect this short to the joints on either side with longs, forming new triangles.

8. Connect the tops of these new triangles with a row of longs.

9. Finally, add the last five shorts so that they meet at a single point in the center of the dome. (You might need to stand inside the dome to tape them together.) To test your dome's strength, see how many magazines you can load on top.

What was the hardest part about creating the dome? What type of triangleform your dome? How many of each?
 * Explain It**

How could you make your dome stronger without interrupting the space underneath it? Make a prediction and test it. || ||  ||
 * Build on It If there is Time:**
 * [[image:http://www.pbs.org/wgbh/buildingbig/images/one_px.gif width="1" height="1" caption=" "]] ||

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