piece of wire is 84 cm long. After making a square frame with a side length of 9 cm, how many cm is left?
一段铁丝长84厘米，做了一个边长是9厘米的正方形框架后，还剩多少厘米？
<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<gadget id="calculator">84 - 36</gadget>
<output>48</output>

<result>48</result>