## DallasLifeBaby01 one year ago Find the circumference of the following circle. (Use 3.14 for π.) drawing in the comments

1. DallasLifeBaby01

|dw:1437871014331:dw|

2. Astrophysics

$C = 2\pi r$

3. Astrophysics

What is the diameter they gave you?

4. DallasLifeBaby01

all they gave me is a picture the one i drew

5. Astrophysics

You were given no dimensions at all?

6. Astrophysics

Check again

7. DallasLifeBaby01

it only has the circle and the 5 inches

8. Astrophysics

Oh so it has 5 inches as the diameter, sorry the image didn't show 5 inches for me.

9. Astrophysics

So you need to find the radius $r = \frac{ d }{ 2 }$

10. DallasLifeBaby01

so would i divide 5 by 2?

11. Astrophysics

Yes, exactly

12. Astrophysics

Because that's the diameter, the radius is half of a the diameter, |dw:1437871404552:dw|

13. DallasLifeBaby01

oh okay thanks

14. Astrophysics

|dw:1437871435710:dw|

15. Astrophysics

See radius is half of the diameter, and np

16. DallasLifeBaby01

how would i find circumference?

17. Astrophysics

$C = 2 \pi r$ circumference is the distance around a circle, which is given by the formula I provided.

18. DallasLifeBaby01

okay so would i multiply 2 x Pi x the radius?

19. Astrophysics

Yup, remember they want you to use 3.14 for pi

20. DallasLifeBaby01

let me solve and ill tell you what i get

21. Astrophysics

Ok np

22. DallasLifeBaby01

i got 15.7

23. Astrophysics

:)

24. DallasLifeBaby01

was i correct?

25. Astrophysics

Yup

26. DallasLifeBaby01

yayy thank you!

27. Astrophysics