Cut a trapezoid into a parallelogram and a triangle. The upper base of the trapezoid is 5 decimeters, the lower base is 8 decimeters, and the height is 7 decimeters. What is the area of the cut parallelogram?
把一个梯形剪成一个平行四边形和个三角形，梯形的上底是5分米，下底是8分米，高是7分米，剪得的平行四边形的面积是多少平方分米．
<gadget id="calculator">5 * 7</gadget>
<output>35</output>

<result>35</result>