What is the area of a square whose diagonal is 10 cm long?
一个正方形，它的对角线的长是10厘米，这个正方形的面积是多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">(1/2) * 10 * 5</gadget>
<output>25</output>

<gadget id="calculator">25 * 2</gadget>
<output>50</output>

<result>50</result>