There are two circles with different sizes. The radius of the larger circle is 6 cm, and the radius of the smaller circle is (1/3) the diameter of the larger circle. What is the radius of the smaller circle in cm?
有两个大小不同的圆，大圆的半径是6厘米，小圆的半径是大圆直径的(1/3)，那么小圆的半径是多少厘米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">6 * 2 * (1/3)</gadget>
<output>4</output>

<result>4</result>