The radius of areas of two circles is 9:25. Find radius of their perimeter
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The ratio of areas of two circles =9:25
area of R1 radius/area of R2 radius=πR1²/πR2²
Now,
πR1²/πR2²=9/25
R1²/R2²=9/25
R1/R2=3/5
The ratio of their perimeter=2πR1/2πR2
=3/5
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