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atai7568
2 năm trước
Cho ΔABC nhọn (AB<AC).Biết AH ⊥BC. Trên đoạn HC lấy D sao cho HB=HD (vẽ hình) a) C/m AB=AD b) Trên tia đối của HA lấy E sao cho HE=HA. C/m AB=ED c) Tia ED cắt AC tại I, Tia AD cắt EC tại K . C/m DI =DK d) C/m IK ⊥ BC
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