The radii of three concentric circles are in the ratio of 4 : 5 : 7. What is the ratio of the area between the two inner circles to that between the two outer circles?

The radii of three concentric circles are in the ratio of 4 : 5 : 7. W

1.	The radii of three concentric circles are in the ratio of 4 : 5 : 7. What is the ratio of the area between the two inner circles to that between the two outer circles?
A.	4 : 7
B.	3 : 8
C.	4 : 5
D.	5 : 9
Answer» C. 4 : 5

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The radii of three concentric circles are in the ratio of 4 : 5 : 7. What is the ratio of the area between the two inner circles to that between the two outer circles?

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