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Emergency Help: Zhao Zhouqiao spans 37.4m and the arch height is about 7.2m m. Find the camber equation of this arch bridge.

Let the center of the circle be the coordinate origin and the radius of the arc be r,

7.2*(2r-7.2)=(37.4/2)^2,r=27.884，

The arch ring equation of circular arch bridge is:

x^2+y^2=27.884^2，

x^2+y^2=777.52.

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