ABC26GN4562 · Area

Subject: General Aptitude · Chapter: Area · Exam: 2008 · Marks: · Difficulty:

If the ratio between the areas of two circles is 4 : 1 then the ratio between their radii will be

(a)1 : 2

(b)2 : 1

(c)1 : 3

(d)4 : 1

Answer

Answer (as printed): B

Explanation

$\frac{\pi R_{1}^{2}}{\pi R_{2}^{2}}=\frac{4}{1} \Rightarrow \frac{R_{1}^{2}}{R_{2}^{2}}=\frac{4}{1} \Rightarrow \frac{R_{1}}{R_{2}}=\frac{2}{1}$.

Explanation as extracted from the printed page; notation may be imperfect.