0

Pi r^2xh

Sun 20 Mar, 2011 06:31 am
volume of a cylinder
Pi r^2xh
which one first?

• Topic Stats
• Top Replies
Type: Question • Score: 0 • Views: 692 • Replies: 7
No top replies

littlek

2
Sun 20 Mar, 2011 06:46 am
PEMDAS

PArenthesis come first (you don't have any)
Multiplication and Division come next, from left to right (Pi x your product of rad sq x height)

1
Sun 20 Mar, 2011 09:10 am
@littlek,
thanks K
now a test for you

Its not propely a cylinder

Its more like a cone with the top cut off.
How can I calculate a volume?
contrex

1
Sun 20 Mar, 2011 09:22 am

a cone with the top cut off.
How can I calculate a volume?

V = 1/3 * pi * (R1^2 + R1 * R2 + R2^2) * h
R1 = Radius of the base
R2 = Radius of the top
h = height of the truncated cone
littlek

1
Sun 20 Mar, 2011 01:24 pm
I'm not sure I get the image, is it a straight up cone ? Then your above formula dived by 3 would work. Otherwise (if it has two blunt ends) go with contrex's formula.
0 Replies

2
Sun 20 Mar, 2011 04:10 pm
Thanks contrex.

does this work?
r1 + r2 + r3 /3 = avg r
pi (avgr)^2 x H

lil K shape is similar to this. wider at base than top but top is not a point
.......... /\ ........
littlek

1
Sun 20 Mar, 2011 04:12 pm
no. At least your formula does not equate to contrex's formula.
0 Replies

contrex

1
Sun 20 Mar, 2011 04:28 pm
@contrex,
V = 1/3 * pi * (R1^2 + R1 * R2 + R2^2) * h

or put another way...

The volume of a circular cone frustum (a cone with the apex sliced off parallel with the base) is

http://en.wikipedia.org/wiki/Frustum

0 Replies

Related Topics

STRAIGHT LINES - Question by iqrasarguru
Possible Proof of the ABC Conjecture - Discussion by oralloy
Help with a simple math problem? - Question by Anonymous1234567890
How do I do this on a ti 84 calculator? - Question by Anonymous1234567890
The bouncing ball - Question by whimsical
Alg. 1 Test prep Questions. - Question by Hay017
Quadratic formula quandry - Question by etrek

1. Forums
2. » Pi r^2xh