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thinkofyou1112
2 năm trước
cho tam giác ABC cân tại A, góc A < 90° . Kẻ BH⊥AC tại H , CK vuông AB tại K. I là giao điểm của BH và CK. A.CM tam giác BHC= CKB B.CM IB=IC, góc IBK=ICH C.CM KH // BC D.CM BC= 5 cm, CH= 3cm, tính diện tích và chu vi tam giác BHC
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