anonymous one year ago I NEED HELP ASAP PLEASE AND THANK YOU! The diameter of the base of a right cone is 8 cm. If the total surface area of the cone is 164(pi) cm2, what is the length of the slant height? (Will Medal and Fan for best answer)

1. anonymous

@Ashleyisakitty If you could help me i would very mich appreciate it! :P

2. anonymous

@Nnesha could you help me?

3. anonymous

hello

4. anonymous

you there?

5. anonymous

yes

6. anonymous

$A=\pi r (r+\sqrt{h^2+r^2})$

7. anonymous

That is the formula for the surface area

8. anonymous

Hold on this is a multiple choice question so these are the answers i just need to narrow it down 12.5 cm 19.5 cm 37 cm 45 cm

9. anonymous

|dw:1434408597776:dw|

10. anonymous

okay the formula will help me hold on

11. anonymous

i kept getting 9.05 for the slant height

12. anonymous

we need to find the height using the formula and then use pythagorean to find the slant length

13. anonymous

ok, give me a sec

14. anonymous

i got 9.05 as well

15. anonymous

yeah but it isnt one of the answers. You have to square root 17 so i was wondering if i should just put 17

16. anonymous

huh, that's strange

17. anonymous

*19.5

18. anonymous

its close to 17

19. anonymous

ohhhhhh 164pi

20. anonymous

i didn't see that pi, let me try again

21. anonymous

i think its 37

22. anonymous

that's what i got

23. anonymous

looks good to me

24. anonymous

Me too

25. anonymous

Ill go with that thank you very much

26. anonymous

no problem