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• 如圖，直線PA與PB分別切圓O於A、B兩點，若∠P＝44°，則∠ACB＝？ (A)68°　(B)72°　(C)76°　(D)80°
• 如圖，圓O1與圓O2相交於B、C兩點，A為圓O1上一點，分別交圓O2於D、E，若 ＝50°， ＝60°，則∠DO2E＝？ (A)55°　(B)100°　(C)110°　(D)120°
• 如圖，已知O點為圓心，若∠AOB＝100°，∠B＝35°，則 ＝？ (A)100°(B)90°(C)80°(D)70°
• 設兩圓半徑分別為rr2，且r1＞r2，若兩圓外切時的連心線段長與兩圓內切時的連心線段長比為2：1，則r1:r2＝？(A)2：(B)3：(C)4：(D)3：2
• 如圖，圓A與圓B分別通過對方的圓心，且相交於P、Q兩點，下列哪一個敘述是錯誤？ (A)四邊形AQBP為菱形 (B) (C) (D) ＝2：1
• 如圖，若 均為一圓的兩弦，則下列敘述何者正確？ (A)連接兩弦的端點所形成的四邊形為長方形(B)連接 (C)∠ADB＋∠ACB＝180°(D)若 與 的交點為E，則∠AEC＝
• 在坐標平面上有一半徑為 的圓O和一直線L，O點的坐標為(－3，4)，若L的直線方程式為y＋1＝0，則下列敘述何者正確？(A)直線L為圓O的切線 (B)直線L為圓O的割線(C)直線L與圓O沒有交
• 如圖，有兩個同心圓，A、B、C在大圓上， 分別交小圓於D、E，若 ＝60°，則∠ACB的度數為何？ (A)15°　(B)30°　(C)60°　(D)120°
• 如圖，直線PC切圓於C點， 長度是 長度的兩倍，若∠PCB＝32°，則∠ACB＝？ (A)64°　(B)72°　(C)84°　(D)88°
• 如圖，將乒乓球放入高腳杯內，若該球與杯子的接觸點為A、C兩點，且球的半徑為8公分， ＝4公分，則此球表面離杯底B點最短的距離為多少公分？ (A)0　(B)(C)(D

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