The base of a triangle is 0.4 meters and the height is 2.5 decimeters, what is its area?
一个三角形的底是0.4米，高是2.5分米，它的面积是多少平方分米
<gadget id="calculator">2.5 / 2</gadget>
<output>1.25</output>

<gadget id="calculator">0.4 * 10 * 1.25</gadget>
<output>5</output>

<result>5</result>