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A bridge has a straight top edge and a lower edge that is a parabolic arch (see picture). At the high point of the parabola arch the road is 2.2 m above the arch. At water level the road is 7.2 m above the arch. The bridge is 31 m long.

A bridge has a straight top edge and a lower edge that is a parabolic arch see picture At the high point of the parabola arch the road is 22 m above the arch At class=


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