The area and base of a triangle and a parallelogram are equal respectively. If the height of the parallelogram is 10 meters, what is the height of the triangle in meters?
一个三角形与一个平行四边形的面积和底分别相等，如果平行四边形的高为10米，那么三角形的高为多少米．
<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<result>20</result>