The upper base of a trapezoid is 2 cm, the lower base is 3 cm, and the height is 2.5 cm. What is its area in square centimeters?
一个梯形的上底是2厘米，下底是3厘米，高是2.5厘米，它的面积是多少平方厘米．
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">2.5 / 2</gadget>
<output>1.25</output>

<gadget id="calculator">5 * 1.25</gadget>
<output>6.25</output>

<result>6.25</result>