圖(十一)為扇形DOF與直角△ABC的重疊情形，其中O、D、F分別在上，且與相切於E點。若 =3，∠DOF=∠ACB=90°，且 = 2 : 1，則AB的長度為何？(A)6(B)3√3-58題庫

21. 圖(十一)為扇形DOF與直角△ABC的重疊情形，其中O、D、F分別在上，且與相切於E點。若 =3，∠DOF=∠ACB=90°，且 = 2 : 1，則AB的長度為何？
(A)6
(B)3√3
(C)6+√3
(D)3+2√3

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