There is a triangular billboard with a base of 1.4 meters and a height of 1.2 meters. It is necessary to spray a layer of paint on both sides. If 0.9 kilograms of paint is used per square meter, how many kilograms of paint do you need to prepare?
有一块三角形广告牌，它的底是1.4米，高是1.2米，要在两面都喷一层油漆，如果每平方米用油漆0.9千克，需要准备多少千克油漆？
<gadget id="calculator">1.2 / 2</gadget>
<output>0.6</output>

<gadget id="calculator">1.4 * 0.6 * 2 * 0.9</gadget>
<output>1.512</output>

<result>1.512</result>