A triangle and a parallelogram have the same base and height, the area of the triangle is 4 square centimeters, what is the area of the parallelogram?
一个三角形和一个平行四边形等底等高，三角形面积是4平方厘米，平行四边形面积是多少．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<result>8</result>