The sum of the three sides of a right triangle is 72 cm, and the ratio of their lengths is 5:4:3. What is the area of the triangle in square centimeters?
一个直角三角形的三条边的和是72厘米，它们的长度的比是5：4：3，这个三角形的面积是多少平方厘米．
<gadget id="calculator">5 + 4 + 3</gadget>
<output>12</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">36 * (5/12)</gadget>
<output>15</output>

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

<gadget id="calculator">36 * (1/3)</gadget>
<output>12</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">15 * 6</gadget>
<output>90</output>

<result>90</result>