What is the radius of the largest circle drawn in a square with side length 7 cm?
在一个边长为7厘米的正方形中画一个最大的圆，它的半径应该是多少厘米．
<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<result>7/2 = around 3.5</result>