7
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The diagram shows two circles of radius 7 cm with centres \(A\) and \(B\). The distance \(A B\) is 12 cm and the point \(C\) lies on both circles. The region common to both circles is shaded.
- Show that angle \(C A B\) is 0.5411 radians, correct to 4 significant figures.
- Find the perimeter of the shaded region.
- Find the area of the shaded region.