A piece of aluminum skin with a length of 1 meter and 80 centimeters and a width of 1 meter is cut into a circle with a radius of 10 centimeters. How many pieces can be cut at most?
一块长1米80厘米，宽1米的铝皮，剪成半径是10厘米的圆片，最多可以剪几个？
<gadget id="calculator">180 / 20</gadget>
<output>9</output>

<gadget id="calculator">100 / 20</gadget>
<output>5</output>

<gadget id="calculator">1 * 5</gadget>
<output>5</output>

<gadget id="calculator">9 * 5</gadget>
<output>45</output>

<result>45</result>