The upper base of the trapezoid is 4 cm, the lower base is 6 cm, and the height is 5 cm. What is the area of the trapezoid in square centimeters?
梯形的上底是4厘米，下底是6厘米，高是5厘米，这个梯形面积是多少平方厘米．
<gadget id="calculator">4 + 6</gadget>
<output>10</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">10 * (5/2)</gadget>
<output>25</output>

<result>25</result>