If two squares with side lengths of 10 cm are put together to form a rectangle, what is the perimeter of the rectangle in cm?
把两个边长为10厘米的正方形拼成一个长方形，这个长方形的周长是多少厘米．
<gadget id="calculator">10 * 6</gadget>
<output>60</output>

<result>60</result>