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Mathematics, 04.12.2021 07:40 cbawesome8

Cho tam giác ABC. Gọi M, N lần lượt là trung điểm của AB và AC a) Tứ giác BMNC là hình gì? Tại sao ?
b) Gọi E là điểm đối xứng của M qua N. Chứng minh rằng tứ giác AECM là hình thoi
c) Tam giác ABC cần có thêm điều kiện gì để tứ giác AECM là :
- Hình chữ nhật
- Hình thoi
- Hình vuông

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Cho tam giác ABC. Gọi M, N lần lượt là trung điểm của AB và AC a) Tứ giác BMNC là hình gì? Tại sao...
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