The area of a triangle is 8.4 square decimeters, what is the area of a parallelogram with the same base and height as it?
一个三角形的面积是8.4平方分米，与它等底等高的平行四边形面积是多少平方分米．
<gadget id="calculator">8.4 * 2</gadget>
<output>16.8</output>

<result>16.8</result>