The ratio of radious of two circles is 5 : 4. what is the ratio of their areas
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Let the first circle be x and the other be y.
X : Y = 5 : 4
The radius of x be a
The radius of Y be 4/5a
Area = πr²
Since π is a constant we take the radius.
a² = area of x
(4/5a)² = 16/25a²
Area of X : Y is :
a² ÷ 16/25a²
a² × 25/16a²
25/16
25 : 16
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