It'll more than likely double the circumference, too. BOOM.
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Nothing - if you double the radius you will get the diameter. The area of the circle will remain the same
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.
I would think it would double also. Say Circle A has a diameter of 1 inch and Circle B has a diameter of 2 inches. To get the circumference, you multiply the diameter by pi (3.14). So 1 x 3.14 = 3.14 so that is the circumference of Circle A. To get the circumference of Circle B you need to multiply 2 x 3.14 = 6.28. And 6.28 is twice 3.14 so I would think the circumference doubles.
it is the length of a circle from left to right you basically double the radius which is half of the diameter.
The circumference of a circle divided by its diameter is equal to the value of pi