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n.t.thanhluong1359
2 năm trước
Cho tam giác DEF vuông tại D, có DE=8cm DF=15cm. Vẽ đường cao DH của tam giác DEF. Gọi K là điểm đối xứng với E qua H. Kẻ đường tròn tâm O đường kính KF cắt DF tại I. C/m HI là tiếp tuyến của đường tròn đường kính KF. Giúp mình gấp vs ạ ;;
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