AMC 8 1993 Problem 17
AMC8 1993 年第 17 题
立体几何★★★☆☆
Problem Square corners, 5 units on a side, are removed from a 20 unit by 30 unit rectangular sheet of cardboard. The sides are then folded to form an open box. The surface area, in square units, of the interior of the box is
从一个 20 × 30 单位的矩形纸板上切掉四个边长为 5 单位的正方形角。然后将四边折叠形成一个开口的盒子。盒子内部的表面积是多少平方单位？
- A.300
- B.500
- C.550
- D.600
- E.1000
正确答案 · Correct Answer
B
解析 · Solution
解析整理中
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