The base of the parallelogram is 30 cm and the height is 2 decimeters. What is its area?
平行四边形的底是30厘米，高2分米，它的面积是多少．
<gadget id="calculator">30 / 10</gadget>
<output>3</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>