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Triangles are the stongest geometrical shape. This is because it has a broad base and a narrow top, just like a pyramid. The 60 degree angles creat a strong shape. Also, the angles are fixed, and connot move without breaking the joints. If you were to use a rectangle, it would be less strong, but what if you aded two diagonals? It would be just as stong as a triangle, but a rectangle with two diagonals is just 2 triangles!
Tension and Compression
When the weight was applied to the bridge, it compressed, so when we built the top cage, we needed to create a mechanism that would create tesion. The way we did this was we conected the cage with popsicle sticks paralel to the base. This way when the weight compressed the bridge, the popsicle sticks tneion kept the bridge from snapping.