What is the area of a large square formed by 4 square bricks with a side length of 5 decimeters?
用4块边长5分米的方砖拼成一个大正方形，它的面积是多少．
<gadget id="calculator">2 * 5</gadget>
<output>10</output>

<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<result>100</result>