如附圖，兩圓交於 A、B 兩點，過 B 點的直線分別與兩圓各交於 C 點和 D 點。已知＝70°，＝100°，求的度數。 (A)200° (B)190° (C)220° (D)210-58題庫

10. 如附圖，兩圓交於 A、B 兩點，過 B 點的直線分別與兩圓各交於 C 點和 D 點。已知＝70°，＝100°，求的度數。
(A)200°
(B)190°
(C)220°
(D)210°

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