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2 năm trước
Bài 3: Cho hình thang cân các đường cao a) Tứ giác là hình gì? b) Chứng minh c) Gọi là điểm đối xứng với qua . Các điểm và đối xứng với nhau qua đường thẳng nào? d) Xác định dạng của tứ giác e) Chứng minh rằng DH bằng nửa hiệu hai đáy của hình thang ABCD. g) Biết độ dài đường trung bình hình thang ABCD bằng 8 , 2 , 5 . cm DH cm AH cm = = Tính diện tích các hình ADH ABKH ABCE ABCD , , , .
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