If the base of a parallelogram is 1.5 meters and the height is 3 meters, what is its area in square meters?
一个平行四边形的底是1.5米，高是3米，它的面积是多少平方米．
<gadget id="calculator">1.5 * 3</gadget>
<output>4.5</output>

<result>4.5</result>