The ratio of the cirumference of two circles is 4 : 1. Find the ratio of their areas.
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let the radius of two circles be r and R
2πr/ 2πR =4:9
r/R = 4:9
area of the circle = π× radius×radius
area of circle1/ area of circle 2=
πr^2/πR^2
=r^2/R^2
{4}^{2} \div {9}^{2}4
2
÷9
2
=16/81
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