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Why is a truss bridge strong?
A truss is a structure made mostly of triangles. Triangles are strong.
Unlike a rectangle, a triangle cannot be undone without changing the length of one of its sides or breaking one of its joints. You can make a rectangle stronger by adding single support between two diagonal corners, turning it into two triangles.
When might you build a truss bridge?
Truss bridges are often built to carry traffic or trains.
Some Truss Bridges
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