The area of a triangle is 5.4cm**2, what is the area of a parallelogram with the same base and height.
一个三角形的面积是5.4cm**2，与它等底等高的平行四边形的面积是多少．
<gadget id="calculator">5.4 * 2</gadget>
<output>10.8</output>

<result>10.8</result>