Draw the largest circle in a rectangle with a length of 10 cm and a width of 7 cm. What is its radius in cm?
在长10厘米，宽7厘米的长方形中画一个最大的圆，它的半径是多少厘米．
<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

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