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► Because it remains rigid. there is only one way to connect 3 lines into a triangle (think about beams and connectors). the structural strength comes from the beams and the connectors. the strength of the connectors is needed to keep the beams together, but the real strength comes from the beams. as long as they don't stretch/shrink, the triangle will be stable.

for a rectangle, the same beams/connectors could be used for a parallelogram. all of the structural strength would have to be in the connectors. if the beams are allowed to pivot at the corners, you will loose the structure

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Q: Why do engineers use triangles in construction?
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