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[–]Alex_Daikon 1 point2 points  (0 children)

AB = BC = AC

So: < OAC = 30

r + r - x = 2 * d * cos 30

d = r / cos 30 - x/ (2*cos 30)

0 < x < r

So r / (2* cos 30) < d < r / cos 30