Ac

Các tiếp tuyến tại \(B\) và \(C\) song song với nhau. 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Một tiếp tuyến của đường tròn (O') tại M cắt đường tròn (O) tại hai điểm B, C. 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Tứ giác \(ABA^{\prime }B^{\prime }\) là \(\mathbf{hình\ thang}\) vì có cặp cạnh đối \(AB\) và \(A^{\prime }B^{\prime }\) song song với nhau.

Số đo \(\angle DAE=\mathbf{90}^{\mathbf{\circ }}\).

AB

Đường thẳng \(AB\) luôn đi qua một điểm cố định C(a, a) (với \(a=OI+OK\)).

Diện tích tam giác \(BCD\) là \(\mathbf{24}\text{\ cm}^{\mathbf{2}}\)

a) Hai đường tròn (O) và (O') cắt nhau tại hai điểm phân biệt vì hiệu hai bán kính nhỏ hơn khoảng cách nối tâm và khoảng cách nối tâm nhỏ hơn tổng hai bán kính (\(7\text{\ cm}<13\text{\ cm}<17\text{\ cm}\)). b) \(OA\) là tiếp tuyến của đường tròn (O') và \(O^{\prime }A\) là tiếp tuyến của đường tròn (O) do tam giác OAO' vuông tại A. Độ dài đoạn thẳng AB là \(\frac{\mathbf{120}}{\mathbf{13}}\text{\ cm}\)

Tuổi dậy các đoạn thẳng ca = da = 6 và CB = DB = 4 b điểm I là trung điểm của đoạn thẳng AB vì ai bằng ib = 4 cm C độ dài đoạn thẳng ik bằng 2

BAC bằng 60 độ abc bằng 30 độ ACB bằng 90 độ góc của tam giác ABC