On a 100:1 drawing, the radius of a circular part is measured as 2 meters. What is the actual area of the circular part in square centimeters?
在一个100：1的图纸上，量得一个圆形零件的半径为2米，这个圆形零件的实际面积是多少平方厘米．
<gadget id="calculator">100 / 1</gadget>
<output>100</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">2 * 1</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<result>12.56</result>