The perimeter of a right triangle is 48dm, and the ratio of the three sides is 3:4:5. What is the area of the triangle?
一个直角三角形的周长是48dm，三条边的比是3：4：5，这个三角形的面积是多少．
<gadget id="calculator">3 + 4 + 5</gadget>
<output>12</output>

<gadget id="calculator">48 / 12</gadget>
<output>4</output>

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

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">12 * 16</gadget>
<output>192</output>

<result>192</result>