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The diagram shows a sector \(O A B\) of a circle, centre \(O\) and radius 7 cm . The angle \(A O B\) is \(140 ^ { \circ }\).
- Express \(140 ^ { \circ }\) in radians, giving your answer in an exact form as simply as possible.
- Find the perimeter of the segment shaded in the diagram, giving your answer correct to 3 significant figures.