A path 2 meters wide is built around a square pool with a circumference of 80 meters. How many square meters of marble are needed to pave this path?
在一个周长为80米的正方形水池的外围修一条2米宽的小路．如果给这条小路铺上大理石，一共需要多少平方米的大理石？
<gadget id="calculator">80 / 4</gadget>
<output>20</output>

<gadget id="calculator">20 + 2 + 2</gadget>
<output>24</output>

<gadget id="calculator">24 * 24</gadget>
<output>576</output>

<gadget id="calculator">20 * 20</gadget>
<output>400</output>

<gadget id="calculator">576 - 400</gadget>
<output>176</output>

<result>176</result>