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Let PQRS be the diameter of a circle of ...


Let PQRS be the diameter of a circle of radius 9 cm. The length PQ,QR and RS are equal Semi-circle is drawn with QS as diameter ( as shown in the given figure). What is the ratio of the shaded region to that of the unshaded region ?

A

`25:121`

B

`5:13`

C

`5:18`

D

`1:2`

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