The circumference of a fish pond is 100.48 meters, and there is a circular island in the middle with a radius of 6 meters. How many square meters is the water area of this fish pond?
一个养鱼池周长是100.48米，中间有一个圆形小岛，半径是6米，这个养鱼池的水域面积是多少平方米？
<gadget id="calculator">100.48 / 3.14 / 2</gadget>
<output>16</output>

<gadget id="calculator">16 ** 2</gadget>
<output>256</output>

<gadget id="calculator">3.14 * 256</gadget>
<output>803.84</output>

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

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

<gadget id="calculator">803.84 - 113.04</gadget>
<output>690.8</output>

<result>690.8</result>