I found a solution online which it said : "It's easy noted that $AG.AE$ = $AD^2$ = $AF^2$ (Using tangent of circumscribed circle)"
I found this not obvious at all. I know that $AD = AF$ but why it had to equal to the product of two inline line?
2026-05-04 11:07:43.1777892863
Tangent of circumscribed circle
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Nevermind, I've found it! It's called "secant-tangent theorem", "intersecting chords theorem", or the "power-of-a-point theorem". Which you can learn in this link..
http://en.wikipedia.org/wiki/Power_of_a_point