DB = CB / 2 = 12 / 2 = 6 MB = CB - CM = 12 - 11 = 1 DM = DB - MB = 6 - 1 = 5 DM^2 + AM ^2 = AD^2 (pythagorean), so 25 + AM^2 = 100 AM = sqrt(75) CA^2 = AM^2 + CM^2 (pythagorean), so CA = sqrt(75 + 121) = sqrt(196) = 14

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