Question

Find the height of the figure below if the volume is 438.72 cm3.

Answers
5.7 cm
11.4 cm
12.25 cm
6.13 cm

Answer 1

What did you get?

Answer 2

i haven't got anything :(

Answer 3

Do you know the formula for finding the volume of a cylinder?

Answer 4

V = pi r^2 h

Answer 5

Great. Now plug that in. \[\large \large r^2\pi h =438.72 \]
The diameter is 7 cm.
Do you know how to find the radius then?

Answer 6

this radius would be 3.5
soo 3.5^2 ph = 438.72

Answer 7

Great. \[\large \large 3.5^2\pi h = 438.72\] 3.5^2 = ?

Answer 8

i got 0.087 but im doing something wrong..

Answer 9

3.5^2 does not give you a number less than 1.
3.5 * 3.5 = ?
Must be over 9.
Tip: Use a calculator.

Answer 10

12.25

Answer 11

ohhh

Answer 12

Graet. \[\large \large 12.25 \pi h = 438.72\] 438.72 / 12.25 = ?

Answer 13

35.8 ? :o

Answer 14

Not quite. Did you use a calculatoR?

Answer 15

yess..

Answer 16

i put it in these ( ) ( ) too

Answer 17

Oh. Wait. Yes, that is correct. >_> (I took a step too far)
Alright, so you are left with, \[\large \large \pi h = 35.8\]

Answer 18

35.8 / (pi) = ?

Answer 19

11.39 which is 11.4 ? (x

Answer 20

Yep. :)
Ding ding.

If you want to make sure if h = 11.4, then plug it in.
3.5^2*(pi)*11.4 =

Answer 21

ohh yay! thanks so much :) i plugged it in too.

Answer 22

Great. I hope this help. :)

Answer 23

it did a lot :)