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The diagram shows a kite \(O A B C\) in which \(A C\) is the line of symmetry. The coordinates of \(A\) and \(C\) are \(( 0,4 )\) and \(( 8,0 )\) respectively and \(O\) is the origin.
- Find the equations of \(A C\) and \(O B\).
- Find, by calculation, the coordinates of \(B\).