How do you find the circumference of a circle? The only information given is that the radius is 6.

Expert Answers
gbeatty eNotes educator| Certified Educator

The formula for the circumference of a circle is C = ПD (circumference = pi times the diameter). The diameter is two times the radius. Therefore, if you have the radius, C = 2 ПR (twice the radius, times pi).

 

If the radius is 6, the circumference is 12 П.

revolution | Student

The formula for circumference of the circle is pi*d or 2*pi*r, where:

d= diameter, r= radius, pi= π

The circumference can be

pi *diameter or 2*(diameter/2( which is the radius))*pi, simplified to be (2*r*pi)

 

tonys538 | Student

The circumference of a circle can be derived from its radius r by using the formula C = 2*pi*r

For a circle with radius 6, the circumference is obtained by substituting r = 6 in the formula given earlier.

C = 2*pi*6 = 12*pi

The circumference of the circle is exactly 12*pi or approximately 37.69

maria-vivanco | Student

The formula for circumference of the circle is pi*d or 2*pi*r Where pi= 3.14

since the radius is given you would do 6*3.14*2 

=37.68

taangerine | Student

What do we know

  • r=6
  • FORMULA FOR CIRCUMFERENCE: C=`2pir=2pid`

In this case we should use C=`2pir`

Plug in r=6 & replace `pi`  with 3.14

  • C=2(6)(3.14)
  • C=37.68

2*pi*r is the equation for the circumference pi is 3.14 and you said radius is 6

so the answer is 37.68

Wiggin42 | Student

The formula for the circumference of a circle is `2xxpixxr` . 

We know the radius so we can get an answer easily. 

`2xxpixx6`

which equals

`12pi`

This is the answer in terms of pi. pi is a mathematical constant equal to 3.14....(a never ending decimal). 

atyourservice | Student

just plug it into these formulas (pi x d )  d= diameter which is (2 x radius)

or

2r x pi 

pi = 3.14

Yojana_Thapa | Student

C = 2 ПR

Given:

R=6

2(3.14)(6) or 2(П)(6) 

circumference = 37.68 or 12П