Eisenbeis/Ramp/Exercise

Dr. Eisenbeis wants to build a bicycle-ramp for her nephews Richy and Franky. The ramp shall rise along a circle arc of the length (everything in meter) ${}\ell =1,2$ and reach a jumping height of ${}h=0,2$ (see image). What (implicit) condition does the angle ${}\alpha$ fulfill (the condition on ${}\alpha$ must be such that it could be solved using the bisection method, but this need not be performed)?

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