The sum of the upper and lower bases of a trapezoid is 16 decimeters, and the height is 4 decimeters. What is the area of the trapezoid in square centimeters?
一个梯形的上底与下底的和是16分米，高是4分米，这个梯形的面积是多少平方厘米．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">16 * 2 * 100</gadget>
<output>3_200</output>

<result>3_200</result>