If you double the radius of a circle, you also double its circumference.
It's now 200% of what it was originally ... an increase of 100% .
See rigorous proof below.
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Let radius = r
Circumference = 2πr
Double the radius:
New radius = 2r
New circumference = 4πr
Increase in circumference = 4πr - 2πr = 2πr = (2πr/2πr) X 100%
=100%
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The circumference is directly proportional to the radius. So increasing the radius by 50% causes the circumference to also increase by 50%.
4.6m. The circumference is double the radius.
The circumference of a circle increases with an increase in the radius as it is directly proportional its radius.
easy you just double it. Additional answer No, that's incorrect. If you double the radius you get the diameter. To get the circumference you multiply the radius by 2 then by 3.142. 3.142 is known as pi
Double the radius and multiply by pi