cho hình thoi ABCD có cạnh dài 10 cm ; AC =12cm kẻ AH vuông góc BC . a,Tính diện tích hình thoi b,Tính AH c,Gọi I là tđ CD,E là điểm đối xứng với A qua I.CMR:BD vuông góc DE và tính diện tích tam giác BDE

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