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Verified answer
L O = 22/7 r r38.5 = 22/7 r r
38.5 x 7 = 22 r r
r r = 38.5x7/22
r r = 12.25
r = 3.5
k O = 2 22/7 r
= 2 22/7 3.5
22 m
B