triangle and a parallelogram have the same base and height, the known area of the triangle is 12.6 square centimeters, what is the area of the parallelogram in square centimeters.
一个三角形和一个平行四边形等底等高，已知三角形的面积是12.6平方厘米，平行四边形的面积是多少平方厘米．
<gadget id="calculator">12.6 * 2</gadget>
<output>25.2</output>

<result>25.2</result>