After Li Hua used up (3/4) of a 4.8-meter-long iron wire, he formed a right-angled triangle with the remaining part. The ratio of the lengths of the three sides of this triangle is 3:4:5. What is the area of this triangle in square decimeters?
一根4.8米长的铁丝，李华用去了(3/4)后，他把剩下的部分围成一个直角三角形，这个三角形的三条边长度的比是3：4：5．这个三角形的面积是多少平方分米？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3 + 4 + 5</gadget>
<output>12</output>

<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">4 / 12</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">4.8 * (1/4) * (1/4) * 4.8 * (1/4) * (1/3) * 100</gadget>
<output>12</output>

<result>12</result>