The upper base of the trapezoid is 5 cm, the lower base is 5.4 cm, and the height is 3 cm. What is the area?
梯形的上底是5厘米，下底是5.4厘米，高是3厘米，面积是多少．
<gadget id="calculator">5 + 5.4</gadget>
<output>10.4</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">10.4 * (3/2)</gadget>
<output>15.6</output>

<result>15.6</result>