Two Perpendicular Chords

Geometry Level 4

In circle Γ \Gamma, two chords AB,CDAB, CD are perpendicular at EE. We have AE=3,EB=7,EC=1AE = 3 , EB = 7 , EC = 1 . Let the radius of Γ\Gamma be RR. What is the value of R2R^2?

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