The circumference of a circle is 31.4cm. With one of its diameters as the base, draw the largest triangle inside the circle. What is the area of this triangle in square centimeters (take 3.14 for π)
一个圆的周长是31.4cm，以它的一条直径为底边，在圆内画一个最大的三角形，这个三角形的面积是多少平方厘米(π取3.14)
<gadget id="calculator">31.4 / 3.14</gadget>
<output>10</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">10 * (5/2)</gadget>
<output>25</output>

<result>25</result>