$\"\"$

Bridge is in the shape of semi elliptical arch.

The bridge has a span of $\"\"$ .

Therefore, $\"\"$ .

Height of the arch at a distance of $\"\"$ from the center is $\"\"$ .

Therefore, the point on the ellipse is $\"\"$ .

Find the height of the arch from the center $\"\"$ .

Standard form of ellipse is $\"\"$ .

Substitute $\"\"$ and $\"\"$ .

$\"\"$

$\"\"$ .

Height of the arch from the center $\"\"$ .

$\"\"$

Height of the arch from the center $\"\"$ . \ \