A square handkerchief with a side length of 35 cm should be sewn with lace around it. What is the length of the lace in cm?
一块边长35厘米的正方形手帕，要给四周缝上花边，花边的长是多少厘米．
<gadget id="calculator">35 * 4</gadget>
<output>140</output>

<result>140</result>