It is known that the area and height of a triangle and a parallelogram are equal respectively, if the base of the parallelogram is 1.8dm, then what is the base of the triangle in dm.
已知一个三角形和一个平行四边形的面积和高分别相等，如果平行四边形的底是1.8dm，那么三角形的底是多少dm．
<gadget id="calculator">1.8 * 2</gadget>
<output>3.6</output>

<result>3.6</result>