Question

If the radius of a circle is doubled, what happens to its circumference ​

Answer 1

Answer:

So when you double theradius, the area goes up by 4 times because 2 squared is 4. The area will always go up by the square of how much the radius goes up. By contrast, the circumference will only double -- from 12.56 to 25.12 because you do not square the radius(or diameter) -- you just multiply it by pi.

Answer 2

Answer:

circumference = 2pie*r

2*pie *2r

circumference increases by 2times