To make a circle with a circumference of 6.28 decimeters, at least a square material with a side length of decimeters must be selected.
要制作一个周长是6.28分米的圆片，至少要选用边长是多少分米的正方形材料．
<gadget id="calculator">6.28 / 3.14</gadget>
<output>2</output>

<result>2</result>