The circumference of a circle is 25.12cm. Draw a triangle inside the circle with its diameter as a side. What is the maximum area of the triangle in cm**2.
一个圆的周长是25.12cm，以它的直径为一条边，在圆内画一个三角形，这个三角形的面积最大是多少cm**2．
<gadget id="calculator">25.12 / 3.14</gadget>
<output>8</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<result>16</result>