An isosceles right triangle, the sum of the two sides is 2.4 decimeters, what is its area in square decimeters
一个等腰直角三角形，两条直角边的和是2.4分米，它的面积是多少平方分米
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2.4 / 2</gadget>
<output>1.2</output>

<gadget id="calculator">(1/2) * 1.2 * 1.2</gadget>
<output>0.72</output>

<result>0.72</result>