Question

find the volume, in inches, of the frustum of the cone shown below.

Answer 1

OK, back to this stuff xD
Any choices? (just to make sure what I am doing is correct before I start)

Answer 2

sadly, no choices lol

Answer 3

isnt the formula\[\frac{ \pi*h }{ 3 } (R^2 +Rr+r^2)\]

Answer 4

I know the formula for this, but you don't have a second radius.

Answer 5

Yeah

Answer 6

yeah i know thats where i got stuck on, im just assuming the second radius is going to be half of the first, so 2?

Answer 7

Would the second radius be half of the radius at the bottom of the cone because the cone has cut exactly in half?

Answer 8

Same. Let's go with that

Answer 9

okay it looks like we're agreeing lol

Answer 10

so i got 381.08 ?

Answer 11

Hahaha :)

OK

So

R = radius of the whole cone
r = radius of the top part
h = height of the bottom part (I believe)

Answer 12

Hold on give me a second

Answer 13

okay no problem :)

Answer 14

Right :)

Answer 15

you got 381.08 too?

Answer 16

Wait, I got 381.18, not .08

Answer 17

hm thats strange. and when i checked it on a calculator i got 380.8

Answer 18

i just redid the math and got 380.08 still. should we compare our work?

Answer 19

Sure. Let me do it on the draw tool. Give me a second

Answer 20

sammixboo help me im stuck!!!