Cut a square piece of paper with an area of 100 square centimeters into the largest circle, what is the area of this circle in square meters?
把一张面积是100平方厘米的正方形纸片剪成一个最大的圆，这个圆的面积是多少㎡．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

<result>78.5</result>