lvlinh38 lvlinh38
  • 10-01-2024
  • Mathematics
contestada

. Cho tam giác nhọn ABC, AH là đường cao. Vẽ HD vuông góc với AB tại D, HE vuông góc với AC tại E. Chứng minh rằng:
a) Tứ giác ADHE nội tiếp.
b) Tứ giác BCED nội tiếp.
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