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doremon.cute321
2 năm trước
Cho tam giác ABC nhọn nội tiếp(O) có AB < AC. Vẽ hai đường cao AD và CN cắt nhau tại H. Vẽ đường kính AK, vẽ dây KE//BC a) Chứng minh AB. AC = AD. AK và A, D, E thẳng hàng. b) Vẽ NF vuông góc với AK. Chứng minh BN F C nội tiếp suy ra B, H, F thẳng hàng. giúp mình với ạ mình đang cần gấp
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