If a parallelogram frame with a height of 6cm, a base of 15cm, and a side of 8cm is stretched into a rectangle, the area will be larger than the original by how many square centimeters.
把一个高为6cm，底为15cm，边为8cm的平行四边形框架拉成一个长方形后，面积比原来大多少平方厘米．
<gadget id="calculator">8 - 6</gadget>
<output>2</output>

<gadget id="calculator">2 * 15</gadget>
<output>30</output>

<result>30</result>