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例1 如图1所示,M 是边长为4的正方形 AD 边的中点,动点P自 A 点起,由 A→B→C→D匀速运动,直线 MP 扫过正方形所形成的面积为 y,点 P 运动的路
Example 1 As shown in Fig. 1, M is the middle point of the square AD side with a side length of 4. The moving point P starts at point A, and is uniformly moved by A→B→C→D. The area formed by the straight line MP sweeps through the square. For y, point P movement path