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Mathematics, 03.09.2021 14:00 oliviaprejean18

Cho tam giác ABC nhọn, nội tiếp trong đường tròn (O). Gọi (d) là tiếp tuyến của (O) tại A. Gọi D, E lần lượt là chân đường cao kẻ từ đỉnh B và C của tam giác ABC. a)Chứng minh tứ giác BCDE nội tiếp

b)Chứng minh DE song song với đường thẳng(d)

c)Cho bán kính đường tròn (O) là R và góc BAC=60. Tính độ dài DE theo R

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