In a right triangle, the sum of the sides is 12 cm, what is the maximum area of the right triangle in square centimeters?
一个直角三角形，两直角边的和是12厘米，这个直角三角形的面积最大是多少平方厘米．
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<result>18</result>