The ratio of the radii of two circles is 1 : 3. Then the ratio of thei

1.	The ratio of the radii of two circles is 1 : 3. Then the ratio of their areas is :
A.	: 3
B.	: 6
C.	: 9
D.	one of these
Answer» D. one of these

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The ratio of the radii of two circles is 1 : 3. Then the ratio of their areas is :

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