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cunghanvi
2 năm trước
Cho ΔABC vuông tại A.Kẻ AH ⊥ BC. a) Chứng minh: $AB^{2}$+$CH^{2}$ = $AC^{2}$+$BH^{2}$ b) Trên AB lấy E ,trên AC lấy điểm F.Chứng minh EF<BC c) Biết AB=6cm ,AC=8cm.Tính AH ,BH ,CH
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