Calculate the area of the triangle: base 400 cm, height 5.25 m.
计算三角形面积：底400厘米，高5.25米．
<gadget id="calculator">400 / 100</gadget>
<output>4</output>

<gadget id="calculator">5.25 / 2</gadget>
<output>2.625</output>

<gadget id="calculator">4 * 2.625</gadget>
<output>10.5</output>

<result>10.5</result>