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Bridges (triangles are very strong structuraly speaking)

Roof of your house

Highway Snowplows (on the big trucks not ones on a pick-up)

Door stop (the ones to keep them open, usually just a slice of pine or rubber)

Street signs (Yield sign and another but point going opposite way, can't think right now)

Pyramids

Ramps (thinking more for handicapped as opposed to skateboard ramp)

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12y ago

What else can I help you with?