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moocher

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?

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duncs in reply to @moocher

sqrt(2)

Edit: should refresh before posting. I'll add the working.

area = pi * r^2

if r = 1, area is pi
if you want to find r for twice the area

then
2 * pi = pi * r^2

cancel pi from both sides

2 = r^2
sqrt(2) = r

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