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ha19
2 năm trước
Mn giúp mình câu này vs nhé( vẽ hình lun nha) Cho tam giác nhọn ABC nội tiếp đường tròn (O). Vẽ các đường cao AH, BK và CP của tam giác ABC, với H thuộc BC, K thuộc AC và P thuộc AB. a) Chứng minh tứ giác BPKC nội tiếp. b) Chứng minh rằng: góc BAH = góc OAC. c) Đường thẳng PK cắt (O) tại hai điểm E và F. Chứng minh OA là tia phân giác của góc EAF.
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