The area of a circle is 12.56 square centimeters, if its radius is enlarged by 3 times, what is the area?
一个圆的面积是12.56平方厘米，如果它的半径扩大3倍后，面积是多少．
<gadget id="calculator">12.56 * 9</gadget>
<output>113.04</output>

<result>113.04</result>