弓形的面积公式是 r^2( x - sinx)/2 , x 用弧度。s/S = ( x - sinx)/(2pi - x + sinx).
回复:圆O半径为r,弦AB将圆O分为S和s两弓形,⦟AOB = x。求:面积比s / S =?
所有跟帖:
• 谢谢!面积比s / S =( x - sinx)/(2pi - x + sinx),与圆半径 r 无关。 -皆兄弟也- ♂ (0 bytes) () 12/01/2011 postreply 22:32:17
弓形的面积公式是 r^2( x - sinx)/2 , x 用弧度。s/S = ( x - sinx)/(2pi - x + sinx).
• 谢谢!面积比s / S =( x - sinx)/(2pi - x + sinx),与圆半径 r 无关。 -皆兄弟也- ♂ (0 bytes) () 12/01/2011 postreply 22:32:17
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