Question

What is the approximate volume of a cone with a height of 9 ft and radius of 3 ft?

Use 3.14 to approximate pi, and express your final answer to the nearest tenth.


ft3

Answer 1

@jabez177

Answer 2

r = radius
h = height

use the formula

volume = (1/3)*pi*h*r^2

Answer 3

radius is 3 ft

Answer 4

3^2

Answer 5

3x3

Answer 6

9

Answer 7

height is 9 ft

Answer 8

look at the equation.
what do u do with the height?

Answer 9

multiply

Answer 10

good
what do u multiply?
what numbers?

Answer 11

by raidias @jabez177

Answer 12

yes
what numbers do u multiply together?

Answer 13

raidius x h

Answer 14

good.
the radius squared

Answer 15

which is 9

Answer 16

now multiply is by the height

Answer 17

i dont understand

Answer 18

You have just done 3 x 3 which is radius^2

Answer 19

or r^2

Answer 20

now we multiply that by the height

Answer 21

what is the height?

Answer 22

9x9

Answer 23

riiiiight!

Answer 24

81

Answer 25

now what is the next step in the equation that @Vocaloid has mentioned?

Answer 26

i dont know

Answer 27

Vocaloid Mathlete Best Response Medals 1
r = radius
h = height

use the formula

volume = (1/3)*pi*h*r^2
9 minutes agoReport Abuse

Answer 28

Re-read that again and tell me what the next step is. :)

Answer 29

(1/3)*pi*h*r^2

Answer 30

@jabez177

Answer 31

Yes.
Now we have done Height and Radius.
Now what is next?

Answer 32

divide by 2

Answer 33

Where did you get that from?

Answer 34

^2

Answer 35

Nope.
I don't know where in the world you got the Divide by 2 from.
As @Vocaloid said.
We now have to multiply by PI

Answer 36

ok calm down

Answer 37

I am calm. :)
Have you multiplied by PI? :)

Answer 38

hold u il do it now

Answer 39

That is what I am asking. :)

Answer 40

254.34

Answer 41

Right on!!!

Answer 42

now i need to round to the nearest tenth

Answer 43

Now you have to divide by 3

Answer 44

ooh

Answer 45

Since multiplying by 1/3 is the same as dividing by 3

Answer 46

84.73

Answer 47

84.78

Answer 48

so 85

Answer 49

Which one is it?

Answer 50

Correct! :)

Answer 51

the answer is 84

Answer 52

i meant 85 dammit

Answer 53

Yes. :)