Mathematics
Senior High
這題要怎麼證明
D 24. 如圖,半徑分別為2與1的大小兩圓相交於C、D兩點,A、B兩點分別在兩個圓上且
線段 AB 通過D點,∠CAD=30°,則∠CBD=
(A)30° (B)45° (C)60° (D)90° (E)120°
B
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