Bài 4: Một khu đất hình tam giác vuông được bao quanh bởi ba con đường. Trên khu đất này có đánh dấu bốn địa điểm A, B, C, D như hình vẽ. Biết các khoảng cách AB = BC = x (km); CD = 1 (km); AD = 2 (km). Học sinh không cần vẽ lại hình, hãy tính diện tích khu đất là bao nhiêu (m2 )?

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