If a circle has the diameter of 8, what is the circumference?

Answer 1

Jane and David are calculating the AREA of that circumference. Seinchin, OMG and Paul are correct. Their answer of 8pi is the right one.

EDIT: for the girl who called retarded to someone... mmm.. no. For the person who asked this question: just check the units in the answer. If we are talking about centimeters, your answer MUST be in centimeters and NOT in squared centimeters.

Answer 2

Pi is the value you get from the ratio of the circumference of the circle divided by its diameter.
Pi = c/d
where c is circumference and d is diameter.
Therefore, if you solve this equation for c you get:
Pi (d) = (c/d)(d)
Pi (d) = c
Now substitute in your specific values.
Pi (8) = c
the circumference is 8 (Pi)
Pi (r^2) is the formula for the area of a circle.

Answer 3

Since the circumference is Pi * R^2 we first determine the radius. The radius of a circle of 8 is 4
so C = Pi * 4^2 or 3.1415 * 16 or 50.264

Answer 4

The formula for finding the circumference is multiply the diameter times Pi or 3.1417. So 8 times 3.14 is around 25 or your anwer 25.13

Answer 5

Ok.... some people on here are retarded. The way to find the circumference of a circle is pi x RXR (or R squared).

If your diameter is 8, R or Radius is 4.

Multilply that by itself or square it and you get 16.

Multiply 16 by pi.

TADA!!!

Answer 6

Circumference of circle = Pi (Diameter of circle)

8(Pi)

Answer 7

The circumference, C, of a circle is equal to π times its diameter, so if the diameter is 8, then the circumference is 8π, or about 25.1

Answer 8

C= pi x r2
radius=4, since radius is half of diameter
radius squared= 16
pi 16 or 3.14 times 16 and that's too much work for me.

Answer 9

diameter of a circle is 2*radius*pi, or pi*diameter

so the diameter is 8 pi, or 25.13

Answer 10

16 pi