Ratio of radii of two circles is 1:16. What is the ratio of their areas?
(E) None of the above
Let radius of the first circle
Let radius of the second circle
Area of the first circle
Area of the second circle
Ratio of their areas
Hence, the answer is (C).
We can directly find ratio of the areas of two given circles.
Ratio of the areas where is the radius of the first circle and is the radius of the second circle.