A square corn field is 60 meters long. If 2 kilograms of corn are harvested per square meter, how many kilograms of corn are harvested in this field?
一块正方形玉米地，边长60米．如果每平方米地收玉米2千克，这块地收得多少千克玉米？
<gadget id="calculator">60 * 60 * 2</gadget>
<output>7_200</output>

<result>7_200</result>