A piece of parallelogram land is 80m long at the base and 4 times as high as the height. What is the area of the land?
一块平行四边形的土地，底长80m，是高的4倍，这块地面积是多少．
<gadget id="calculator">80 / 4</gadget>
<output>20</output>

<gadget id="calculator">80 * 20</gadget>
<output>1_600</output>

<result>1_600</result>