Nothing happens. A person sitting next to you won't know that you did anything to
your circle. But you'll have a bigger circle. The radius will be double the originasl radius.
The circumference will be double the original circumference. The area will be four times
the original area.
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It'll more than likely double the circumference, too. BOOM.
Nothing - if you double the radius you will get the diameter. The area of the circle will remain the same
If the diameter doubles (x2), the cross-sectional area quadruples (x4).
It doubles The volume of a cylinder height times diameter squared times 3.14
you double the radius to find the diameter.