If the sum of the upper and lower bases of a trapezoid is 22 cm and the height is 10 cm, what is the area in square centimeters?
一个梯形的上底与下底的和是22厘米，高是10厘米，面积是多少平方厘米．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">22 * 5</gadget>
<output>110</output>

<result>110</result>