A rectangle with a length of 38 cm: iron wire is used to form a rectangle, its length is 12 cm, and its area is how many square centimeters.
用一根长38厘米：铁丝围成一个长方形，它的长是12厘米，面积是多少平方厘米．
<gadget id="calculator">12 * 7</gadget>
<output>84</output>

<result>84</result>