Taking the square root of y will result in a plus/minus, and discarding the minus erases the lower half of the ellipse. The long axis extends horizontally, and the short axis extends vertically. The x and y axis bisects the ellipse already, so both a and B. are available: 525' and 350'.
The width of the channel is, once again, determined by inputting a known point.
Hence, the semi-elliptic bridge allows 315 ft of clearance from the centerline, or 630 ft in all.
If the river flooded, the tanker would sit 10 ft higher and would, hence, have only the clearance available at 290 ft. For the parabola:
For the...
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