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Mathematics, 26.07.2021 14:50 qdogisbeast7662

Cho tứ giác ABCD. Gọi I, K thứ tự là điểm tiếp xúc của đường tròn nội tiếp tam giác ABD, tam giác BCD với BD. Gọi E, F thứ tự là điểm tiếp xúc của đường tròn ngoại tiếp tam giác ABC và ADC với AC. Chứng minh: IK=EF

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Cho tứ giác ABCD. Gọi I, K thứ tự là điểm tiếp xúc của đường tròn nội tiếp tam giác ABD, tam giác BC...
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