If 4 small squares with an area of 1 square centimeter are arranged side by side to form a rectangle, what is the perimeter of the rectangle in centimeters?
用4个面积是1平方厘米的小正方形并排成一个长方形，长方形周长是多少厘米．
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<result>10</result>