Master Wang intercepted the largest parallelogram from a trapezoidal iron plate with an upper base of 5.5 cm, a lower base of 7.5 cm, and a height of 4 cm. What is the area of this parallelogram in square centimeters?
王师傅从一个上底是5.5厘米、下底是7.5厘米、高是4厘米的梯形铁片上截取一个最大的平行四边形．这个平行四边形的面积是多少平方厘米．
<gadget id="calculator">4 * 5.5</gadget>
<output>22</output>

<result>22</result>