If the perimeter of a face of a cube is 4 meters, what is its surface area in square meters?
正方体的一个面的周长是4米，它的表面积是多少平方米．
<gadget id="calculator">4 / 4</gadget>
<output>1</output>

<gadget id="calculator">1 * 1 * 6</gadget>
<output>6</output>

<result>6</result>