Answer: r=2
Explanation:
C=2 x r x pi
4pi= 2r x pi /:pi
4=2r /:2
2=r --> r=2
Answer:
To find the radius of a circumference of a circle
C=2π r
C=4π
4π=2×π×r
To get radius
Divide through by 2π
r=2
To find the area
A=πr^2
A=3.142×2^2
A=3.142×4
A=12.568 units square
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