The ratio of the radii of 2 circles os 1:2 .
Find Ratio of their
a) cirumferences
b) area
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Answer:
a) ratio of circumferences of two circles
= 2pir1 : 2pir2
= r1 : r2
= 1:2
b) ratio of areas of two circles
pir^2 : pir^2
r1^2 : r2^2
1:4
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