The area of a triangle is 18 square meters, its height is 9 meters, and its base is in meters.
一个三角形的面积是18平方米，它的高是9米，它的底是多少米．
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">18 * (2/9)</gadget>
<output>4</output>

<result>4</result>