3
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The diagram shows part of a circle with centre \(O\) and radius 6 cm . The chord \(A B\) is such that angle \(A O B = 2.2\) radians. Calculate
- the perimeter of the shaded region,
- the ratio of the area of the shaded region to the area of the triangle \(A O B\), giving your answer in the form \(k : 1\).