The base of a parallelogram is 8.5cm, the height is 3.4cm, what is its area in cm**2.
一个平行四边形的底是8.5cm，高是3.4cm，它的面积是多少cm**2．
<gadget id="calculator">8.5 * 3.4</gadget>
<output>28.9</output>

<result>28.9</result>