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AB^2 = 25,5^2 - 12^2
AB^2 = 650,25 - 144
= 506,25
AB = 22,5
CD = DE = 13
BD^2 = CD^2 - BC^2
= 13^2 - 12^2
= 169 - 144
= 25
BD = 5
BD = DF
AF = AB - BD - DF
AF = 22,5 - 5 - 5
AF = 10,5