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What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angles. measure need asap

Place the following steps in order to complete the square and solve the quadratic equation,

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters