Cut a square with a side length of 10 cm into the largest sector with the side length as the radius. What is the area of the sector in the area of the square?
在一个边长为10厘米的正方形中，以边长为半径，剪成一个最大的扇形．扇形面积占正方形面积的多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) * 3.14 * 100</gadget>
<output>78.5</output>

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

<gadget id="calculator">78.5 / 100</gadget>
<output>0.785</output>

<result>0.785</result>