anonymous one year ago FIND THE LENGTH OF THE RADIUS, CIRCUMFERENCE, AND THE AREA OF THE CIRCLE.USE 3:14 FOR pi

1. DanJS

what are you given for a quantity

2. anonymous

|dw:1436492233225:dw|

3. DanJS

diamerter is 4.9 cm radius is from center to the edge, half of that.. radius =4.9/2 cm

4. anonymous

2.45

5. DanJS

now calculate $C = 2*\pi*r$ $A = \pi*r^2$ with those values approx

6. anonymous

huh

7. DanJS

use $\pi~\approx~3.14$ r=2.45 and calculate C-circumference and A- Area for the circle

8. anonymous

ok

9. anonymous

im so lost someone help

10. DanJS

Circumference of a circle is the same as 2 times pi(3.14) times the radius C = 2*pi*r fill in the numbers and calculate

11. anonymous

2*3.14*2.45=15.386 does this = the circumference

12. DanJS

yes , i would keep 2 decimals for sig figures on it 26.39

13. DanJS

15.39

14. anonymous

area would = 3.14*2.45^2=18.84785

15. anonymous

what 26.39 for

16. DanJS

mistype... yeah looks good

17. DanJS

just remember the way to calculate those numbers, and what the radius and diameter are for the circle..

18. anonymous

ok thank you