A triangular steel plate with a base of 4.2 meters and a ratio of height to length of 0.8 meters. If the steel plate weighs 45.5 kg per square meter, how much does the steel plate weigh?
一块三角表钢板，底是4.2米，比高长0.8米．如果每平方米钢板重45.5千克，这块钢板重多少千克？
<gadget id="calculator">4.2 - 0.8</gadget>
<output>3.4</output>

<gadget id="calculator">3.4 / 2</gadget>
<output>1.7</output>

<gadget id="calculator">4.2 * 1.7 * 45.5</gadget>
<output>324.87</output>

<result>324.87</result>