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Mathematics, 27.08.2021 08:50 kenishawilkinsoy4mgw
Bài 8:Từ điểm A ở ngoài đường tròn (O, R) vẽ hai tiếp tuyến AB và AC và một cát
tuyến ADE không đi qua tâm (O) (B, C là các tiếp điểm và AD < AE).
a) Chứng minh tứ giác ABOC nội tiếp được đường tròn, xác định tâm và bán
kính của đường tròn đó ?
b) Gọi H là giao điểm của OA và BC. Chứng minh AH. AO = AD .AE = AB2
c) Gọi I là trung điểm của DE. Qua B vẽ dây BK // DE. Chứng minh ba điểm
K, I, C thẳng hàng.
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Bài 8:Từ điểm A ở ngoài đường tròn (O, R) vẽ hai tiếp tuyến AB và AC và một cát
tuyến ADE không đi...
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