This is a powerpoint that walks you through how you can build a quadratic function from some simple parameters such as bridge span and highest point. The students can then see how a quadratic function could be used to model the structure.
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I didn't do the second half but found the first half just using a bridge to show parabolas made the students really think.
This is an interesting extension to work on quadratic curves, incorporating transformations of curves too. Thanks for sharing.
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