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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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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

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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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