A parallelogram and a triangle have the same base and height, and the area of the triangle is known to be 17cm**2, so what is the area of the parallelogram?
一个平行四边形和一个三角形等底等高，已知三角形的面积是17cm**2，那么平行四边形的面积是多少．
<gadget id="calculator">17 * 2</gadget>
<output>34</output>

<result>34</result>