After cutting the length of a rectangle with a length of 10.6 decimeters to 2.1 decimeters, it becomes a square. What is the area of the original rectangle?
把一个长10.6分米的长方形的长剪去2.1分米后，使它成为一个正方形．原来长方形的面积是多少平方分米？
<gadget id="calculator">10.6 - 2.1</gadget>
<output>8.5</output>

<gadget id="calculator">10.6 * 8.5</gadget>
<output>90.1</output>

<result>90.1</result>