Mathematics, 26.07.2021 18:10, sirdre1982

. Cho tam giác ABC vuông tại A. Các tia phân giác BM và CN cắt nhau tại I. Gọi D, E, F lần lượt là hình chiếu của điểm I xuống các cạnh AB, AC, BC. a) So sánh AN và BN; AM và CN.
b) Chứng minh AD = AE.
c) Tính độ dài các đoạn thẳng AD, AE nếu AB = 8cm, AC = 15cm.

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. Cho tam giác ABC vuông tại A. Các tia phân giác BM và CN cắt nhau tại I. Gọi D, E, F lần lượt là h...