If the length of a set of opposite sides of a square is increased by 3 centimeters to form a rectangle, the area is increased by 24 square centimeters, what is the area of the original square in square centimeters?
如果一个正方形的一组对边的长增加3厘米成为长方形，面积就增加24平方厘米，则原来的正方形面积是多少平方厘米．
<gadget id="calculator">24 / 3</gadget>
<output>8</output>

<gadget id="calculator">8 * 8</gadget>
<output>64</output>

<result>64</result>