What is the perimeter of a square whose side length is (4/9) decimeters?
边长(4/9)分米的正方形的周长是多少分米．
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(4/9) * 4</gadget>
<output>16/9 = around 1.777778</output>

<result>16/9 = around 1.777778</result>