Uncle Zhang uses a 28 cm long wire to form a 10 cm long rectangle. What is the area of this rectangle in square centimeters?
张叔叔用一根28厘米长的铁丝围成一个长10厘米的长方形，这个长方形的面积是多少平方厘米？
<gadget id="calculator">28 / 2</gadget>
<output>14</output>

<gadget id="calculator">14 - 10</gadget>
<output>4</output>

<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<result>40</result>