As shown in the figure, to build a seedling shed, the width a is 2m, the height B is 1.5m, and the length d is 10m______ m2．

From the figure given in the title, we can see that a, B and C form a triangle, and a and B are two right angles, C is hypotenuse, ∧ A2 + B2 = C2, a = 2m, B = 1.5m, C = 2.5m, ∫ d = 10m, s = CD, ∧ the area of plastic film covering the top is s = CD = 25m2, so the answer is: 25

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