The sum of the upper and lower bases of a trapezoid is equal to its height. It is known that its height is 16 cm, what is the area of this trapezoid in square centimeters.
一个梯形的上、下底的和与它的高相等．已知它的高是16厘米，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">16 * 8</gadget>
<output>128</output>

<result>128</result>