If I have a circle of radius 1 then what would the radius of a second circle need to be for it to have twice the area of the first?
Area of a circle is pi×r². If you want circle A to have double the area of circle B you need a² to be 2×b². So a is √2×b as stated by the others.
@frankenbike started
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If I have a circle of radius 1 then what would the radius of a second circle need to be for it to have twice the area of the first?