ABCD is rectangle with AB = 9 cm and BC = 18 cm. O is the midpoint

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ABCD is rectangle with AB = 9 cm and BC = 18 cm.

O is the midpoint of BC.

OAED is a sector of a circle, centre O. Find

a. AO

b. Angle AOD, in radians

c. The area of the shaded region.

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