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In the figure given below, ABCD is the d...

In the figure given below, ABCD is the diameter of a circle of radius 9 cm. The lengths AB, BC and CD are equal. Semicircles are drawn on AB and BD as diameters as shown in the figure. What is the area of the shaded region ?

A

`9pi`

B

`27pi`

C

`36pi`

D

`81pi`

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