triangular steel plate has a base of 18 decimeters and a height of 4 decimeters. If the steel plate weighs 3 kilograms per square decimeter, how many kilograms does this steel plate weigh?
一块三角形钢板，底是18分米，比高长4分米，如果每平方分米钢板重3千克，这块钢板重多少千克？
<gadget id="calculator">18 - 4</gadget>
<output>14</output>

<gadget id="calculator">14 / 2</gadget>
<output>7</output>

<gadget id="calculator">18 * 7 * 3</gadget>
<output>378</output>

<result>378</result>