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What is the ratio of the area of the larger circle to the area of the smaller circle

What is the ratio of the area of the larger circle to the area of the smaller circle-example-1

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The formula of an area of a circle:


A=\pi r^2

We have R = 6mm and r = 5 mm.

Substitute:


A_1=\pi(6^2)=36\pi\ mmm^2\\\\A_2=\pi(5^2)=25\pi\ mm^2

The ratio:


(A_1)/(A_2)=(36\pi)/(25\pi)=(36)/(25)

Answer: 36 : 25

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