The base of a parallelogram is 18 decimeters and the height is twice the base. What is the area of the parallelogram in square meters?
一个平行四边形底是18分米，高是底的2倍，这个平行四边形面积是多少平方米．
<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<gadget id="calculator">36 / 100</gadget>
<output>9/25 = around 0.36</output>

<gadget id="calculator">18 * (9/25)</gadget>
<output>162/25 = around 6.48</output>

<result>162/25 = around 6.48</result>