As shown on the right,large square area is 10cm的平方 larger than the small sruare area,Please calculate the area of the circle.小生感激不尽!
来源：学生作业帮助网 编辑：六六作业网 时间：2024/12/25 03:06:11
As shown on the right,large square area is 10cm的平方 larger than the small sruare area,Please calculate the area of the circle.小生感激不尽!
As shown on the right,large square area is 10cm的平方 larger than the small sruare area,Please calculate the area of the circle.
小生感激不尽!
As shown on the right,large square area is 10cm的平方 larger than the small sruare area,Please calculate the area of the circle.小生感激不尽!
S=π（10÷2﹚²=25π
S=π﹙10√2÷2﹚²=50π
大师帮忙，小生感激不尽！！
第一题，设圆半径是r，则圆内接正方形面积=2r^2，圆外切正方形面积=4r^2 由题意有4r^2-2r^2=10cm^2
解得r^2=5cm^2 所以圆面积=5兀cm^2，约等于15.7平方厘米
第二题：设圆半径为r，则大正方形面积=2r^2，小正方形面积=r^2 所以2r^2-r^2=10cm^2 即r^2=10cm^2 圆面积=10兀cm^2 约等于31.4平方厘米。...
全部展开
第一题，设圆半径是r，则圆内接正方形面积=2r^2，圆外切正方形面积=4r^2 由题意有4r^2-2r^2=10cm^2
解得r^2=5cm^2 所以圆面积=5兀cm^2，约等于15.7平方厘米
第二题：设圆半径为r，则大正方形面积=2r^2，小正方形面积=r^2 所以2r^2-r^2=10cm^2 即r^2=10cm^2 圆面积=10兀cm^2 约等于31.4平方厘米。
收起
1 5π
2 10π