The height and area of a triangle and a parallelogram are the same. The base of the triangle is 40 cm. What is the base of the parallelogram in cm?
一个三角形与一个平行四边形的高和面积都相等，三角形的底是40厘米，平行四边形的底是多少厘米．
<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<result>20</result>