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18-02-2024
Mathematics

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Bài 2. Cho BDC biết BD  6 cm ; BC  10 cm và
DC  12 cm. Dựng phía ngoài BDC tam giác
BAD sao cho BA  3 cm ; DA  5 cm.
a) Chứng minh:   BDC ABD ∽ .
b) Chứng minh: tứ giác ABCD là hình thang.
c) Gọi O là giao điểm của AC và BD . Tính OD .

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