A reversed curve is to connect two tangents which is parallel to each other and are 200m apart with directions due east. There is an intermediate tangent of 200m in between the reversed curve and the horizontal distance of the PC and PT measured parallel to the tangents is 800 m long. The P.C of the reversed curve is on the upper tangent while that of P.T. of the reversed curve is the lower tangent. Determine the common radius of the reversed curve in meters

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