In the Shanghai World Expo Park, there is a large guide board in the shape of an isosceles trapezoid. The upper base is 4m, the lower base is 6m, and the height is 2.5m. Paint is painted on both sides of it. What is the area to be painted? square meters. (The thickness of the guide plate is not counted)
上海世博园中，有一块大的导引牌是等腰梯形形状，上底是4m，下底是6m，高是2.5m，在它的正反两面都刷油漆，求刷油漆的面积是多少平方米．(导引牌的厚度不计)
<gadget id="calculator">4 + 6</gadget>
<output>10</output>

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

<gadget id="calculator">10 * 1.25 * 2</gadget>
<output>25</output>

<result>25</result>