Roughly fifty square miles it sat along the german-belgian border within a triangle outlined by aachen monschau and duren.

沿着德比边境占地大约五十平方英里，其位于亚琛、蒙绍和杜伦组成的三角轮廓内。

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A yield sign is a triangle with a white background and a red border.

避让标志牌是白底红边三角形。

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For the purposes of this problem, you may assume that the trees are of point size, and that any tree (point) lying exactly on the border of a triangle is considered to be in the triangle.

为简化题目，你可以认为树都一个无穷小的点，而精确位于三角形边上的树应算作在三角形内的。

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For the purposes of this problem, you may assume that the trees are of point size, and that any tree (point) lying exactly on the border of a triangle is considered to be in the triangle.

为简化题目，你可以认为树都一个无穷小的点，而精确位于三角形边上的树应算作在三角形内的。

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