Cut the largest triangle out of a semicircular steel plate with a diameter of 14dm, what is the area of this triangle?
在一个直径为14dm的半圆形钢板上裁下一个最大的三角形，这个三角形的面积是多少平方分米？
<gadget id="calculator">14 / 2</gadget>
<output>7</output>

<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">14 * (7/2)</gadget>
<output>49</output>

<result>49</result>