The base of a triangle is 0.4 meters and twice the height, what is its area?
一个三角形的底是0.4米，是高的2倍，它的面积是多少．
<gadget id="calculator">0.4 / 2</gadget>
<output>0.2</output>

<gadget id="calculator">0.2 / 2</gadget>
<output>0.1</output>

<gadget id="calculator">0.4 * 0.1</gadget>
<output>0.04</output>

<result>0.04</result>