The upper base of the trapezoid is 5cm, the lower base is 2cm longer than the upper base, and the height is 4cm. What is the area in cm**2.
梯形的上底是5cm，下底比上底长2cm，高是4cm，面积是多少cm**2．
<gadget id="calculator">5 + 2 + 5</gadget>
<output>12</output>

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

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<result>24</result>