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kstribk95
2 năm trước
Cho ABC có AB = AC = 10cm, BC =12cm. Kẻ AH vuông góc với BC (H BC) a) Chứng minh: HB = HC và HAB HAC   b) Tính độ dài AH ? c) Kẻ HD  AB ( DAB ), kẻ HE  AC (EAC). Chứng minh: AHD = AHE và HDE là tam giác gì ? Vì sao ? d) Chứng minh: DE // BC ?
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