Section A ( 57 marks )
1 . The following diagram shows a circle with centre O and radius 20 cm . A , B and C are three points on the circumference such that
A
B
AOC ˆ � 1.5 radian .
1.5
O 20
C
( a ) Find the area of the shaded region .
( b ) Find the arc length ABC .
( c ) Hence , find the exact perimeter of the non-shaded region .
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