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一位教师在一次考试中,出了如下一道试题,求下面阴影部分的面积(单位:厘米)如图一。70％的学生还糊里糊涂地解答出来了。
A teacher in an exam, out of the following questions, seeking the shadow below the area (in centimeters) as shown in Figure one. Seventy percent of students are still confusedly answered.