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AB = 45 / 360 x 22 / 7 x d
4.5 = 990 d / 2520
4.5 x 2520 = 990 d
11340 = 990 d
d = 11340 / 990
d = 11.45
maka..
AD = 180 / 360 x 22 / 7 x 11.45 = 45342 / 2520 = 18