Area and Perimeter Practice Test 2

Question : 40 of 40

Marks: +1, -0

If the ratio of areas of two circles is 4 : 9, then the ratio of circumferences will be:

Solution:

A_1/A_2

{πr_1^2}/{πr_2^2}

r_1^2/r_2^2

∴

r_1/r_2

2/3

Hence,

{2πr_1}/{2πr_2}

2/3

Since, required ratio = 2 : 3

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