Question

Joseph is building a cone using modeling clay. The cone has a radius of 7 cm and a height of 12.5 cm. Joseph adds additional clay, keeping the radius the same, until the cone reaches a height of 18 cm.

How much clay did Joseph add? Use 3.14 to approximate pi and round the answer to two decimal places.

____cm3

@Directrix

Answer 1

Strategy: the taller cone volume minus the smaller cone volume

Answer 2

so 18-7?

Answer 3

Taller: Vcone = 1/3 * 3.14 * 7 * 18

@TeenWolfGirl What is this: 1/3 * 3.14 * 7 * 18 =

Answer 4

131.88

Answer 5

Shorter: Vcone = 1/3 * 3.14 * 7 * 18

@TeenWolfGirl What is this: 1/3 * 3.14 * 7 * 18 =

Answer 6

131.88

Answer 7

131.88 Correct for Taller Volume

Answer 8

either of you know the value of negative 29?

Answer 9

how about you post the question

Answer 10

this is my question because i need help

Answer 11

Whoa. I messed up on the shorter volume.

Answer 12

Shorter: Vcone = 1/3 * 3.14 * 7 * 12.5

Sorry. @TeenWolfGirl 1/3 * 3.14 * 7 * 12.5 = ?

Answer 13

31.583 so now i subtract, correct?

Answer 14

31.583 is not the volume of the shorter cone. Or, I messed up.

Answer 15

sorry no meant 91.583

Answer 16

131.88-91.583=100.297

Answer 17

Okay, so do 131.88 - 91.58 for the final

Answer 18

I did not get what you did.

Answer 19

oh then i would get 131.88-31.58=100.3

Answer 20

so my answer is 100.3, correct?

Answer 21

It is this: 131.88 - 91.58

Not 131.88-31.58

Answer 22

i meant 91.58

Answer 23

so my answer is 100.3, correct?

NO

Answer 24

40.3, correct?

Answer 25

Thanks

Answer 26

Yes, 40.30 is what I got.

Answer 27

You are welcome.