How many circles with a radius of 2 cm can be cut from a rectangular cardboard with a length of 12 cm and a width of 8 cm.
在一张长12厘米，宽8厘米的长方形纸板上，一共能剪多少个半径是2厘米的圆．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>