题库搜索>问题求解PS-12206
A circular mat with diameter 20 inches is placed on a square tabletop, each of whose sides is 24 inches long. Which of the following is closest to the fraction of the tabletop covered by the mat?
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
我有更好的解析 
暂无雷哥网文字解析
圆的面积是Pi*10*10,正方形的面积是24*24, 结果为（Pi*10*10）/(24*24)=0.545, 最接近1/2
追梦的猪猪
不用计算的方法： (π * 10²)/(24*24)≈314/25²≈314/625约等于1/2 但是因为刚才分母用了更大的数字25，而且分子舍去了千分位以后的数字，所以整体数字肯定要比 1/2 大一丢丢。 看选项前两个排除，1/2 后面直接 3/4 了，比 1/2 大太多。选 1/2
3
0
回复
2021-11-04 15:04:00
科目：
问题求解PS
来源：
GWD
题目信息2m38s
平均耗时
76.7%
平均正确率
该题由网友axl2uil提供
点击上传问题求解PS -17839
A circular rim 28 inches in diameter rotates the same number of inches per second as a circular rim 35 inches in diameter. If the smaller rim makes x revolutions per second, how many revolutions per minute does the larger rim make in terms of x?
问题求解PS -17836
Note: Figure not drawn to scale.In the previous figure, three squares and a triangle have areas of A, B, C, and X as shown. If A=144,B=81,andC=225,then X=
问题求解PS -17834
The figure above shows 2 circles. The larger circle has center A, radius R cm, and is inscribed in a square. The smaller circle has center C, radius r cm, and is tangent to the larger circle at point B and to the square at points D and F. If points A, B, C, and E are collinear, which of the fol...
问题求解PS -17828
In the figure above, PQ is a diameter of cirde O, PR= SQ, and ΔRST is equilateral. If thelength of PQ is 2, what is the length of RT?
问题求解PS -17826
In the figure above, the area of the shaded region is
问题求解PS -17839
A circular rim 28 inches in diameter rotates the same number of inches per second as a circular rim 35 inches in diameter. If the smaller rim makes x revolutions per second, how many revolutions per minute does the larger rim make in terms of x?
问题求解PS -17836
Note: Figure not drawn to scale.In the previous figure, three squares and a triangle have areas of A, B, C, and X as shown. If A=144,B=81,andC=225,then X=
问题求解PS -17834
The figure above shows 2 circles. The larger circle has center A, radius R cm, and is inscribed in a square. The smaller circle has center C, radius r cm, and is tangent to the larger circle at point B and to the square at points D and F. If points A, B, C, and E are collinear, which of the fol...
问题求解PS -17828
In the figure above, PQ is a diameter of cirde O, PR= SQ, and ΔRST is equilateral. If thelength of PQ is 2, what is the length of RT?
问题求解PS -17826
In the figure above, the area of the shaded region is
分享
周末、晚班滚动开班 
24+35+35+6课时 
