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thanhcong3197
2 năm trước
cho hình thang vuông ABCD, có góc A và góc D bằng 90 độ. Gọi H là điểm đối xứng với B qua AD, Ìa giao điểm của CH và AD. chứng minh: góc AIB = góc DIC mn help mik với, ko vẽ hình cx đc do mik còn có 10 điểm thui nên chỉ cho 10 điểm mong mn thông cảm
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