Circles

The areas of the two circles are in the ratio 2:20. The larger circle has a diameter 20. Calculate the radius of the smaller circle.

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You need to know the following knowledge to solve this word math problem:

algebra
equation
arithmetic
square root
division
planimetrics
circle
area of the shape
basic functions
ratio
units
area
8th grade (13y)
9th grade (14y)
high school

We encourage you to watch this tutorial video on this math problem: video1