The upper base of a trapezoid is 4 cm, the lower base is 12 cm, and the height is 6 cm. What is the area of the trapezoid in square centimeters?
一个梯形的上底是4厘米，下底是12厘米，高是6厘米，这个梯形的面积是多少平方厘米
<gadget id="calculator">4 + 12</gadget>
<output>16</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">16 * 3</gadget>
<output>48</output>

<result>48</result>