Mensuration Practice Test 1

Question : 14 of 40

Marks: +1, -0

The ratio of the radii of two circles is 5 : 4. What is the ratio of their areas?

Solution:

Ratio of two radii of circles = R : r
= 5x : 4x
Ratio of area of two circles =

πR^2 : πr^2

π(5x)^2 : π(4x)^2

(5x)^2 : (4x)^2

25 : 16

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