rectangle is surrounded by a wire, 5 decimeters long and 3 decimeters wide. If you straighten it out and form a square, what is the perimeter of the square?
用一根铁丝围一个长方形，长5分米，宽3分米．如果把它拉直，再围成一个正方形，正方形的周长是多少分米．
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<result>16</result>