Câu 7: Tam giác ABC và MNP có: 𝐴̂ = 𝑃̂ = 90°, 𝐵̂ = 𝑀̂, BC = MN. Giả sử AC = 4 cm; MP = 4√3 cm thì MN có độ dài là: A. 10,93 cm B. 2√7 cm C. 8 cm D. 4√10 cm Câu 8: Cho tam giác ABC vuông cân tại A, qua A kẻ đường thẳng xy không cắt đoạn BC, kẻ BH ⊥ xy tại H, CK ⊥ xy tại K. Biết BH = 3cm, CK = 4cm. Hãy chọn đáp án đúng: A. Diện tích ∆ABC bằng 12,5 𝑐𝑚2 B. AC = 25cm C. BC = 5√2cm D. BC = 7cm

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