The ratio of the radii of of two circles is 4:5.Find the ratio of their areas.
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The ratio of the radii of of two circles is 4:5.Find the ratio of their areas.
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Step-by-step explanation:
let the radius be R1 and R2 and their ratio be x.
given,R1/R2=4x/5x
area of circle=πr²
πR1²/πR2²
R1²/R2²
4²/5²
16/25
ratio of areas=16:25