If the length of the side of an isosceles right triangle is 5 decimeters, what is its area?
一个等腰直角三角形的腰长是5分米，它的面积是多少．
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">5 * (5/2)</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>