The radii of three concentric circles are in the ratio 1 : 2 : 3. Find the ratio of the area between the two… · ABC26GN4285
Subject: General Aptitude · Chapter: Area · Exam: S.S.C. 2008
The radii of three concentric circles are in the ratio 1 : 2 : 3. Find the ratio of the area between the two inner circles to that between the two outer circles.
Answer
No answer key was printed for this question.
Explanation
Let the radii of the three concentric circles be r, 2r and 3r respectively. \ Required ratio = p[(2r)2 – r2] : p[(3r)2 – (2r)2] = 3pr2 : 5pr2 = 3 : 5.
Explanation as extracted from the printed page; notation may be imperfect.