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Chirikatori
2 năm trước
Cho tam giác nhọn ABC nội tiếp đường tròn ( 0; R ) sao cho số đo cung AB = 90 0 , số đo cung AC = 120 0 . a/ Tính theo R độ dài AB , AC. b/ Kẻ AH vuông góc với BC, tính BH, CH suy ra độ dài BC ( theo R ) c/ Chứng minh OH vuông góc với AC . Tính OH theo R.
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