Areas of two circles have ratio . What is the ratio of their radii?

**(A)**

**(B)**

**(C)**

**(D)** **(E)** None of the above

Let area of the first circle

Let area of the second circle

Let radius of first circle

Let radius of second circle

It is given that

Taking square root on both sides, we get

Hence, the answer is **(A)**.

We can directly find ratio of the radii of two circles if ratio of their areas is given to us.

**Ratio of their radii** where A1 is the area of the first circle and A2 is the area of the second circle.