What is the area of a square whose perimeter is 4 decimeters
一个周长是4分米的正方形，它的面积是多少平方分米
<gadget id="calculator">4 / 4</gadget>
<output>1</output>

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

<result>1</result>