A 12 cm long wire is used to form a 4 cm long rectangle, what is the area of this rectangle in square centimetres?
用一根长12厘米的铁丝围成一个长4厘米的长方形，这个长方形的面积是多少平方厘米．
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

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

<result>8</result>