Use two 12-decimeter-long ropes to form a rectangle and a square respectively. Which figure has a larger area? How big is it? (Please write down the calculation process)
用两根长12分米的绳子，分别围成一个长方形和一个正方形，哪一个图形面积大一些？大多少？(请你写清计算过程)
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">9 - 8</gadget>
<output>1</output>

<result>1</result>