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## anonymous 3 years ago 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

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1. anonymous

2. anonymous

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

3. anonymous

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

4. anonymous

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

5. anonymous

How? none of the options are right

6. anonymous

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. anonymous

yea, it'd be 4 for the height

8. anonymous

what happened to the $$\pi$$

9. anonymous

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

10. anonymous

Divied 3 In 12 your answer is 4

11. anonymous

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

12. anonymous

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

13. anonymous

it's just a way to check if your answer's right

14. anonymous

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

15. anonymous

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

16. anonymous

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

17. anonymous

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

18. anonymous

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

19. anonymous

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. anonymous

ok, sure thing!

21. anonymous

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

22. anonymous

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

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