Question

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

Answer 1

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

Answer 2

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

Answer 3

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

Answer 4

How?
none of the options are right

Answer 5

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

Answer 6

yea, it'd be 4 for the height

Answer 7

what happened to the \(\pi\)

Answer 8

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

Answer 9

Divied 3 In 12 your answer is 4

Answer 10

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

Answer 11

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

Answer 12

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

Answer 13

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

Answer 14

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

Answer 15

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

Answer 16

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

Answer 17

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

Answer 18

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

Answer 19

ok, sure thing!

Answer 20

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

Answer 21

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