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semi-ellipse

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A semi ellipse 2017-07-25
From Ian:
The arch of the bridge is in the shape of semi ellipse,with its major axis at the water level.suppose the arch is 20ft. High in the middle,and 120 ft. Across its major axis. How high above the water level is the arch,at a point 20 ft.from the center (horizontally). Round of 2 decimal places
Answered by Penny Nom.
 
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