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fonz

Can some Perris jumper tell me...

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or is that 2(pi)r??

Allow me to be the arrogant former physics student and refresh your memory.
(0) The diameter (d) is twice the radius (r).
(1) The circumference(sp?) of a 2-D disc = 2*pi*r
(2) The area of a 2-D disc = pi*r^2
(3) The area of a 3-D sphere = 4*pi*r^2
(4) The volume of a sphere = 4/3*pi*r^3
Note that (1) and (2) are each other's integral/derivative.
Same goes for (3) and (4).
That's not coincidental.
Alphons
http://www.liacs.nl/~avwerven

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"(0) The diameter (d) is twice the radius (r).
(1) The circumference(sp?) of a 2-D disc = 2*pi*r
(2) The area of a 2-D disc = pi*r^2
(3) The area of a 3-D sphere = 4*pi*r^2
(4) The volume of a sphere = 4/3*pi*r^3"
Hmmm....Can we get the "Physics for Dummies" version...LOL
"I got some beers....Let's Drink em!!!"
Clay

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***Note that (1) and (2) are each other's integral/derivative.
Same goes for (3) and (4). That's not coincidental.
You know, I had noticed that, but I didn't want to seem like a fool and ask the question. Thanks for clearing that up.
:-)
Steve

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Hmmm....Can we get the "Physics for Dummies" version...

Okay, you asked for it:
Pi is a number that has an infinite number of decimal digits.
The first 20 decimals are 3.14159265358979323946 if I remember correctly, by heart.
(0) The diameter is twice the radius
(1) The circumference(sp?) of a flat disc equals 2 times pi
(2) The area of a flat disc equals pi times the radius times the radius
(3) The area of a sphere equals 4 times pi times the radius times the radius
(4) The volume of a sphere equals 4 over 3 times pi times the radius times the radius times the radius
It's not actually physics though. It sheer math.
Alphons
http://www.liacs.nl/~avwerven

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