Given that the area of a triangle is 18 cm**2, what is the area of a parallelogram with the same base and height in cm**2?
已知一个三角形的面积是18厘米**2，则与它等底等高的平行四边形的面积是多少厘米**2．
<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<result>36</result>