On a piece of rectangular paper with a length of 42 cm and a width of 36 cm, cut out the largest square, how many square centimeters are left?
在一张长42厘米，宽36厘米的长方形纸上，剪下一个最大的正方形，还剩下多少平方厘米？
<gadget id="calculator">42 * 36</gadget>
<output>1_512</output>

<gadget id="calculator">36 * 36</gadget>
<output>1_296</output>

<gadget id="calculator">1_512 - 1_296</gadget>
<output>216</output>

<result>216</result>