Welcome to our tutoring boards! :) This page summarizes main points from our posting guidelines. As our name implies, we provide math help (primarily to students with homework). We do not generally post immediate answers or step-by-step solutions. We don't do your homework. We prefer to help...
As I understand it, you are given that B (a vertex) and G (the center) of the square lie on the circle, and you want to find 2 times the tangent of the marked angle. (I can't translate "mallar" without knowing the language!)
What have you tried? Do you want to use coordinate geometry, or trigonometry directly, or what?
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