When Xiao Ming shoots arrows, the target is divided into bullseye, inner circle and outer circle. What is the probability that Xiao Ming hits the inner circle? The radius of the outer ring is 9 cm; the radius of the inner ring is 6 cm; the radius of the bullseye is 3 cm.
小明射箭，箭靶被分成靶心、内圈和外圈．小明射中内圈的概率是多少？外圈半径9厘米；内圈半径6厘米；靶心半径3厘米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>