Please cut out the largest square on a rectangular paper with a length of 15 cm and a width of 10 cm. What is the remaining figure? What is the perimeter of this figure in centimeters?
请在一个长15厘米、宽10厘米的长方形纸上剪下一个最大的正方形，剩下的是什么图形？这个图形的周长是多少厘米？
<gadget id="calculator">15 - 10</gadget>
<output>5</output>

<gadget id="calculator">10 + 5</gadget>
<output>15</output>

<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<result>30</result>