If a circle with a diameter of 20 cm is cut off from the center of a circle with a radius of 6 cm, what is the remaining area in square centimeters?
一个直径是20cm的圆纸片，在它的正中心剪去一个半径是6cm的圆，则剩余部分是多少平方厘米．
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">3.14 * 36</gadget>
<output>113.04</output>

<gadget id="calculator">314 - 113.04</gadget>
<output>200.96</output>

<result>200.96</result>