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lephidoa6tnt
2 năm trước
Cho tam giác ABC. Vẽ trung tuyến AD, BE, CF. Từ F kẻ đường thẳng song song với AD cắt ED tại I. a) Chứng minh rằng IC // BE và IC = BE b) Cho biết AD vuôn góc với BE. Chứng minh ICF là tam giác vuông và chu vi của tam giác này bằng tổng độ dài ba đường trung tuyến của tam giác ABC
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