How many circles with a radius of 1 cm can be cut from a rectangular piece of paper with a length of 8 cm and a width of 2 cm.
一张长8厘米，宽2厘米的长方形纸，可以裁下多少个半径为1厘米的圆．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<result>4</result>