If a pair of opposite sides of a square is increased by 2 cm each to form a rectangle, the area is increased by 16 cm2, what is the area of the original square?
如果一个正方形的一对对边各增加2厘米成为长方形，面积就增加16平方厘米，原来的正方形面积是多少．
<gadget id="calculator">16 / 2</gadget>
<output>8</output>

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

<result>64</result>