The decorative board at the entrance of a store is isosceles trapezoidal, its upper base is 6 meters, the lower base is 12 meters, and the height is 2 meters. To paint this decorative board, 1 kg of paint is used per square meter. How many kilograms of paint is needed in total?
一家商店门口的装饰牌是等腰梯形，它的上底是6米，下底是12米，高是2米，油漆这块装饰牌，每平方米用油漆1千克．一共要油漆多少千克？
<gadget id="calculator">6 + 12</gadget>
<output>18</output>

<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">18 * 1 * 1</gadget>
<output>18</output>

<result>18</result>