Triangles for Kids: Why the Strongest Shape Has Three Sides

The story of triangles for kids: why a triangle will not squash flat when a square does, and how Gustave Eiffel built his tower in Paris from triangles in 1889.

• What engineers mean by rigidity
• How more than 18,000 iron pieces in the Eiffel Tower are laced into triangles
• Where triangles hold things firm, from bicycle frames to bridges
• Quiz questions to answer along the way

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