What is the perimeter of a square with side length (1/2) decimeters?
边长(1/2)分米的正方形的周长是多少分米．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 4</gadget>
<output>2</output>

<result>2</result>