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The diagram shows a metal plate \(A B C D\) made from two parts. The part \(B C D\) is a semicircle. The part \(D A B\) is a segment of a circle with centre \(O\) and radius 10 cm . Angle \(B O D\) is 1.2 radians.
- Show that the radius of the semicircle is 5.646 cm , correct to 3 decimal places.
- Find the perimeter of the metal plate.
- Find the area of the metal plate.