## Skittles10412 Group Title 4. What is the value of x, if the volume of the cone is 12m3? (1 point) 4 m 5 m 6 m 10 m one year ago one year ago

1. Skittles10412 Group Title

2. Skittles10412 Group Title

for the 12m^3 it should be 12pim^3

3. electrokid Group Title

volume of cone is: $V={1\over3}\pi r^2 h$ we have V=12m^3 r = (6/2)=3m find h = ?

4. Skittles10412 Group Title

would the answer be 4? for the height???

5. electrokid Group Title

How? none of the options are right

6. Skittles10412 Group Title

because how i got it was right it was 4 and i did that by doing 1/3*3^2 and got 3 and the only one that would get me to 12 was 4 because 3*4= 12

7. Chelsea04 Group Title

yea, it'd be 4 for the height

8. electrokid Group Title

what happened to the $$\pi$$

9. electrokid Group Title

the question must have volume as $$12\pi\,{\rm m^3}$$

11. Chelsea04 Group Title

you could use pythagoras' theorem to work out the height btw...cause it is a right angled triangle.

12. Skittles10412 Group Title

I didnt know that I could use that. ^_^

13. Chelsea04 Group Title

14. Skittles10412 Group Title

oh yeah now i remember lol this home schooling thing has kinda gottin my mind going a lil slow lol

15. Chelsea04 Group Title

you could also substitute values into the formula and solve for h, which is the preferred method

16. electrokid Group Title

are you still sure the question does not have a "pi" in there?

17. Chelsea04 Group Title

didn't @Skittles10412 write that 'for the 12 m^3 it should be 12pi m^3' at the top of the page?

18. Skittles10412 Group Title

yeah im positive i finished the questions and i got 4m

19. Skittles10412 Group Title

yeah i had to retype it to make sure that people who were going to help me knew that it was 12pi m^3 not 12m^3

20. Chelsea04 Group Title

ok, sure thing!

21. Skittles10412 Group Title

yup and than you to every one who helped me :)

22. Whiterabbit541 Group Title

volume of cone = (1/3)(pi) x r^2 x h (pi) = 3.14159265359 6/2 = 3 12(pi) = (1/3)(pi) x 3^2 x h 12(pi) x 3 = (1/3 x 3/1) (pi) x 3^2 x h 36(pi) = (pi) x 3^2 x h 36(pi) = (pi) x 9 x h 36(pi)/(pi) = (pi)/(pi) x 9 x h 36 = 9 x h 36/9 = 9/9 x h 4 = h Answer = a) 4 m