Let PQRS be the diameter of a circle of radius 9 cm. The length PQ, QR – McqOptions

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1.	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
Answer» C. 5 : 18

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