Anecdotes please - quadratic equations in real life

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(05-05-2024 01:24 PM)EdS2 Wrote:  Can anyone share any experiences when they came across a quadratic equation in real life? (Let's not count the very simple case where only a square root is needed.)

2 times:
1. creating a net for simulating the head of a forming rotating press into a steel mass, for producing pipes for use in atomic plant (the head was a circle with tangent lines)
2. calculating the interference point between a ray tracing and a glas ocular