A parallelogram and a triangle have the same base and area. The height of the parallelogram is 4 cm. What is the height of the triangle in cm?
一个平行四边形和一个三角形等底等面积，平行四边形的高是4cm，三角形的高是多少cm．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<result>8</result>