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Circumference = 2 times pi times radius. Circumference of a circle is the distance along the edge of the circle. Radius is the distance from the center of the circle to the edge. Pi is the ratio that was derived from relationships in dimensions of circles. It is an irrational number; its value is approximately 3.1416

Q: What is c equals 2πr?

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If: C = 2r Then: r = C/2

2r-1=9 2r =10 r =5

A math problem

You can use the following formula: C=2r∙3.14 Therefore C=2∙14∙3.14 Find the product of 2 and 14 which equals 28. Now C=28∙3.14 Find the product of 28 and 3.14 which equals 87.92. Therefore the circumference is 87.92ft.

r + s = 4 and 2r + 3s = 8 multiply the first equation by 2 giving 2r + 2s = 8 subtract this from the second equation giving s = 0 So r = 4 and s = 0.

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If: C = 2r Then: r = C/2

2r(pi)=C where C is circumference. Therefore the radius equals C/2(pi)

2r-1=9 2r =10 r =5

If: 7 -2r = 13 Then: r = -3

If: -7 = 7-2r Then: r = 7

|2r + 9| = 5 So 2r + 9 = 5 or 2r + 9 = -5 so that 2r = -4 or 2r = -14 r = -2 or r = -7

-2r

r -31

r=8

10+r = 2r Subtract r from both sides:- r = 10

A math problem

C (Circumference) = 3.14 (pi)*D (diameter) r (radius) = 0.5D and D = 2r So circumference can also be C=3.14*2r Then, solve 68 = 3.14*2r to get r = 10.83