When Xiao Ming calculated the area of a rectangular lawn, he mistakenly regarded the width of 12 meters as 21 meters, and the resulting area was 972 square meters more than the correct one. What is the correct lawn size?
小明在计算一块长方形草坪的面积时，错把其中的宽12米看成21米，结果得到的面积比正确的多了972平方米．正确的草坪面积是多少？
<gadget id="calculator">21 - 12</gadget>
<output>9</output>

<gadget id="calculator">972 / 9</gadget>
<output>108</output>

<gadget id="calculator">12 * 108</gadget>
<output>1_296</output>

<result>1_296</result>