The sum of the upper and lower bases of a trapezoid is 16 cm, and the height is half of the sum of the upper and lower bases. What is the area of the trapezoid in square centimeters?
一个梯形的上、下底的和是16厘米，高是上、下底和的一半，这个梯形的面积是多少平方厘米．
<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">16 * 4</gadget>
<output>64</output>

<result>64</result>