If the area of a triangle is 9.8 square decimeters, what is the area of a rectangle with the same base and height?
一个三角形的面积是9.8平方分米，和它等底等高的长方形的面积是多少．
<gadget id="calculator">9.8 * 2</gadget>
<output>19.6</output>

<result>19.6</result>