1. If \(AB =12 cm\), \(BC = 16 cm\) and \(AB\) is perpendicular to \(BC\), then the radius of the circle passing through the points \(A, B\) and \(C\) is ____________\(cm\)
2. In the figure, if \(∠ABC = x=20^°\), then \(∠AOC\) is equal to ___________\(^\circ\)
