The diameter of a copper coin is 4cm, and the side length of the square in the middle is 0.6cm. What is the area of this copper coin in square centimeters?
一枚铜钱直径是4cm，中间的正方形边长为0.6cm．这枚铜钱的面积是多少平方厘米？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

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

<gadget id="calculator">0.6 * 0.6</gadget>
<output>0.36</output>

<gadget id="calculator">12.56 - 0.36</gadget>
<output>12.2</output>

<result>12.2</result>