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hoangnhungaz808
2 năm trước
Cho đường tròn (c) có phương trình x^2 +y^2+12x-4y-9=0 a) Tìm tâm và bán kính của đường tròn (C) b) Viết phương trình tiếp tuyến của (C) biết tiếp tuyến vuông góc với đường thẳng có phương trình: 3x – 4y + 15 = 0 c)Tìm m để đường thẳng: x + y – m + 2 = 0 cắt đường tròn (C) tại hai điểm phân biệt A, B sao cho S IAB lớn nhất (I là tâm đường tròn)
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