## jakyfraze one year ago Using the formula C = 2πr, find the circumference of a circle with diameter of 28 inches. A. 56 in. B. 28 in. C. 88 in. D. 44 in.

1. jakyfraze

@Nnesha can you please explain this to me

2. Nnesha

they already gave u the formula so just plugin the value remember radius is half of diameter r= d/2

3. anonymous

28/2=14 C= 2 PI 14 = 87.96 C. 88

4. anonymous

c

5. Nnesha

$r=\frac{ d }{ 2}$ d=diameter r= radius so replace d with 28 to find radius

6. jakyfraze

@Nnesha so the answer is A?

7. anonymous

8. Nnesha

how did you get 56 ?

9. Nnesha

d/2 = what ? replace d with 28

10. jakyfraze

11. jakyfraze

so decide 28/2? 14

12. Nnesha

yes right now 2 pi times 14

13. Nnesha

$C = 2\pi r$ so substitute for 14 then solve

14. jakyfraze

2 pi x 14?

15. Nnesha

yes right

16. jakyfraze

oh okay. pi= 3.14 x 2 = 6.28. 6.28 x 14 = 87. 92. ANSWER 88 :D right?

17. Nnesha

yes right

18. jakyfraze

yes!! thank you :)

19. jakyfraze

jazakallah khair

20. Nnesha

:=)