A wire is 62.8 decimeters long, and it is surrounded by two circles of equal size. What is the area of each circle in square meters?
一根铁丝长62.8分米，把它围成大小相等的两个圆，每个圆的面积是多少平方米？
<gadget id="calculator">62.8 / 2</gadget>
<output>31.4</output>

<gadget id="calculator">31.4 / 3.14 / 2</gadget>
<output>5</output>

<gadget id="calculator">3.14 * 5 * 5</gadget>
<output>78.5</output>

<gadget id="calculator">78.5 * 2</gadget>
<output>157</output>

<result>157</result>