MB = BC-MC = 12-11 = 1BC = 12, and so: BD = DC =6Thus, DM = DB - MB = 6-1=5Accordingly, AM = V(10^2 - 5^2) = V(75)But MC = 11, and so:AC = sqrt(AM^2 + MC^2)= sqrt(75+121) = sqrt(196)

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