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congkg1111
2 năm trước
Đề: Cho hình thang ABCD biết góc A = 90 độ, góc D = 90 độ và AB < DC. Hai đường chéo AC và BD vuông góc với nhau tại O. a, Cho AB = 12cm, DB = 24cm. Hãy tính độ dài các đoạn thẳng AD, AO, DO, DC, AC. b, Kẻ BH vuông góc với DC tại H. Tính diện tích tam giác COH.
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