The area of a triangle is 40cm**2, what is the area of a parallelogram with the same base and height in cm**2?
一个三角形的面积是40cm**2，与它等底等高的平行四边形面积是多少cm**2．
<gadget id="calculator">40 * 2</gadget>
<output>80</output>

<result>80</result>