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Asked by sherrybear - 2 years ago
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ynes Level 50
Answered 2 years ago
5
The formula for the circumference of a circle is 2(pi)r = C

twice the radius times (pi).

If you double the radius, you double the circumference.

Example:

r=1, circumference = 2(pi)
r=2, circumference = 2(pi)*2=4(pi)
r=4, circumference = 2(pi)*4=8(pi)
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joensf Level 75
Answered 2 years ago
4
Dear friend 1) Circumference of a circle is 2Pir so when r is doubled r=2r
so circumfernce, S= 2pi.2r
=4pir
so circumfernce will double
2) similarly area =4pir^2
Source(s):
senior mathematics teacher

http://answers.yahoo.com/question/index?...
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BubbaMex Level 11 / Professional Retiree
Answered 2 years ago
3
Make the circle bigger.
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Sparky5458 Level 62 / Retired
Answered 2 years ago
2
It will double also.
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