The radius multiplied by 2 => 2r
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double the radius or multiply by 2 the radius
The diameter is double (two times) the radius, no matter what the radius is.
you double the radius to find the diameter.
the area doubles. for example: the radius is 2. so the area is 4pi. then double the original radius of 2 to 4 and the area is 8pi. 8pi is double 4pi.
Nothing - if you double the radius you will get the diameter. The area of the circle will remain the same