The area of a circle is 26.86 square centimeters. If the radius of the circle is doubled, what is the area of the circle in square centimeters?
一个圆的面积是26.86平方厘米，如果把这个圆的半径扩大2倍，那么这个圆的面积是多少平方厘米．
<gadget id="calculator">26.86 * 4</gadget>
<output>107.44</output>

<result>107.44</result>