A piece of tablecloth with a side length of 12 decimeters, with lace sewn around it, how many decimeters is the lace length?
一块边长12分米的桌布，四周缝上花边，花边长多少分米？
<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<result>48</result>