The length of the rectangle is 5.2 cm, and it is 1.8 cm more than the width. What is the perimeter of the rectangle in cm?
长方形长5.2cm，比宽多1.8cm，长方形周长是多少cm？
<gadget id="calculator">5.2 - 1.8</gadget>
<output>3.4</output>

<gadget id="calculator">5.2 + 3.4</gadget>
<output>8.6</output>

<gadget id="calculator">8.6 * 2</gadget>
<output>17.2</output>

<result>17.2</result>