The area and base of a triangle and a parallelogram are equal respectively. The height of the parallelogram is 3.5 cm. What is the height of the triangle in cm?
三角形与一个平行四边形的面积、底分别相等，平行四边形的高是3.5厘米，这个三角形的高是多少厘米．
<gadget id="calculator">3.5 * 2</gadget>
<output>7</output>

<result>7</result>