



 
Hi Ian, I drew a diagram with the Xaxis at the water and the middle of the bridge at the Yaxis. Since the arch of the bridge is in the shape of a semi ellipse the equation of the ellipse is \[\frac{x^2}{a^2} + \frac{y^2}{b^2} = 1\] for some real numbers $a$ and $b.$ Use the coordinates of two of the points you know on the bridge to find $a$ and $b.$ Penny  


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