A rectangular vegetable field is 63 meters long and long (4/9) wide. What is the area of this vegetable field?
一块长方形菜地，长为63米，宽是长的(4/9)，这块菜地面积是多少．
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">63 * (4/9) * 63</gadget>
<output>1_764</output>

<result>1_764</result>