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Cho tam giác ABC vuông ở B, AB= 8 cm, BC = 6 cm. Gọi D là điểm đối xứng của B qua AC. a) CMR : bốn điểm A, B, C, D cùng thuộc một đường tròn. b) Tính bán kính đường tròn nói trong câu a.
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