A triangle and a parallelogram have the same area and the same height. The base of the parallelogram is 1.8 cm. What is the base of the triangle in cm?
一个三角形和一个平行四边形的面积相等，高也相等，平行四边形的底为1.8厘米，三角形的底是多少厘米．
<gadget id="calculator">1.8 * 2</gadget>
<output>3.6</output>

<result>3.6</result>