What is the area of an isosceles right triangle whose sum of two sides is 12 cm?
一个等腰直角三角形，两直角边的和是12厘米，它的面积是多少平方厘米．
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<result>18</result>