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oanhha26102002
2 năm trước
Cho tam giác ABC vuông tại A (AB<AC), đường cao AH. Từ H vẽ HE và HF lần lượt vuông gốc với AB và AC ( E thuộc AB, F thuộc AC) a) Tứ giác AEHF là hình gì? Tại sao b) Trên tia FC xác định điểm K sao cho FK = AF. Chứng minh tứ giác EHKF là hình bình hành P/s: vẽ hình luôn nka <3
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