The ratio of the height to the base of an isosceles triangle is 4:3. If it is cut along the height to form a rectangle with a perimeter of 9 cm, what is the area of the triangle in square centimeters?
一个等腰三角形的高与底的比为4：3，如果沿高剪开拼成一个长方形周长为9厘米，原来这个三角形的面积为多少平方厘米．
<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">8 + 3</gadget>
<output>11</output>

<gadget id="calculator">8 / 11</gadget>
<output>8/11 = around 0.727273</output>

<gadget id="calculator">(9/2) * (8/11)</gadget>
<output>36/11 = around 3.272727</output>

<gadget id="calculator">(9/2) - (36/11)</gadget>
<output>27/22 = around 1.227273</output>

<gadget id="calculator">(9/2) * (8/11) * (27/22)</gadget>
<output>486/121 = around 4.016529</output>

<result>486/121 = around 4.016529</result>