Iftheredcirclehasradius=10,findtheradiusofthebluecirclesuchthatthebluecirclecutsawayhalftheareaoftheredcircle. :Theradiusofthebluecirclehastobelargerthantheradiussoftheredcircle.Why?
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兰色圆半径=10因为1. Area A = Area B所以兰色圆O1一定经过红色圆O2的圆心O2因为2. The center of the blue circle is on the perimeter of the red circle.所以O1O2就是红色圆O2的半径设两圆一个交点为C,则三角形O1O2C是等边三角形,所以O1C=O1O2=10