The ratio of the circumferences of two circles 2 : 5. Find the ratio of their areas

Circumference one = (2R) * pi let that value be 2x

C second = 5x = (2R) * pi * 5 / 2 = (5R) * pi

So Radius one / Radius two = 2 / 5

Area1:Area2=pi (2R) ^2:pi (5R) ^2=pi (4R^2) : pi (25R^2), pi cancel out we get

4R^2:25R^2, now R^2 cancel out and we get ratio of

4:25