Sign in
Please select an account to continue using cracku.in
↓ →
If C1 and C2 are the circumferences of the outer and inner circles respectively. What is C1 : C2?
(I) The two circles are concentric.
(II) The area of the ring is $$\frac{2}{3}$$ the area of greater circle.
The area between the 2 circles is $$\pi\ $$(R^2 - r^2). The ratio of this area to that of the bigger circle's is 2/3.
So, $$\pi\ $$(R^2 - r^2) = (2/3) $$\pi\ $$(R^2)
=> (R^2) = 3 x (r^2)
=> r/R = (1/$$\sqrt{\ 3}$$)
=> (2$$\pi\ $$r)/(2$$\pi\ $$R) = (1/$$\sqrt{\ 3}$$) = C1:C2
$$\therefore\ $$ Statement II alone is sufficient to answer the question.
Create a FREE account and get:
Book Free CAT Mentorship
Get personalized CAT strategy from a 99%iler
500+ students mentored
OTP Verification
Enter the 6-digit code sent to your phone
Booking Summary
Enter OTP
Didn't receive the OTP?
Start your IIM journey with the right preparation and crack CAT 2026.
Educational materials for CAT preparation
Ask our AI anything
AI can make mistakes. Please verify important information.
AI can make mistakes. Please verify important information.
91- 6303239042
