如图,在平面直角坐标系中,直线
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmi%3Ey%3C%2Fmi%3E%3Cmo%3E%3D%3C%2Fmo%3E%3Cmo%3E%E2%88%92%3C%2Fmo%3E%3Cmfrac%3E%3Cmrow%3E%3Cmsqrt%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmsqrt%3E%3C%2Fmrow%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmfrac%3E%3Cmi%3Ex%3C%2Fmi%3E%3Cmo%3E%2B%3C%2Fmo%3E%3Cmsqrt%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmsqrt%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
交x轴于A点,交y轴于B点,点C是线段AB的中点,连接OC,然后将直线OC绕点C逆时针旋转30°交x轴于点D,再过D点作直线DC
1∥OC,交AB与点C
1 , 然后过C
1点继续作直线D
1C
1∥DC,交x轴于点D
1 , 并不断重复以上步骤,记△OCD的面积为S
1 , △DC
1D
1的面积为S
2 , 依此类推,后面的三角形面积分别是S
3 , S
4…,那么S
1=
,若S=S
1+S
2+S
3+…+S
n , 当n无限大时,S的值无限接近于
.
![](http://tikupic.21cnjy.com/6f/a1/6fa1054acb912550bd76d9588c5a796d.png)