What is the area of an isosceles right triangle whose waist length is 10 decimeters?
一个等腰直角三角形它的腰长是10分米，面积是多少？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">10 * 5</gadget>
<output>50</output>

<result>50</result>