H-dog, pie r round, cornbread r square!!
My last year of college I had to take Chemistry 101 as a required class. In the first lab we were learning how to calculate volume (duh-pretty simple task after 4 years of engineering classes) and we each had to take an object from a box, measure it, and calculate its volume. I chose a cylinder because I was lazy and only wanted to measure 2 dimensions. But our worksheet had spaces for length, width, and height. I only filled in two: diameter and height, then calculated the volume. When I handed it in, the TA pointed out that one of the spaces was blank. I explained that I had a cylinder and only needed 2 dimensions to calculate the volume. She began to argue with me that it wasn't possible and I needed a third dimension to find the volume of a cylinder!!! And this girl was a grad student?? I realized on the first day that I wasn't going to get much out of that lab class. The second class she came over and apologized and agreed that I was right, you can find the volume of a cylinder with just diameter and height.
Another way of looking at displacement (sometimes it helps me to derive a formula so I understand where it's coming from):
Find the area of the cylinder:
(bore)x(bore)x(PI)/(4) or
(1/2 bore)x(1/2 bore)x(PI) (same thing different way)
Then multiply by height of cylinder (stroke):
(bore)x(bore)x(PI)/(4)x(stroke) or
(1/2 bore)x(1/2 bore)x(PI)x(stroke)
Then multiply by the number of cylinders to find the total displacement of the engine:
(bore)x(bore)x(PI)/(4)x(stroke)x(# cyl) or
(1/2 bore)x(1/2 bore)x(PI)x(stroke)x(# cyl)
Note that the first equation is the same as Travis' because PI/4 = .7854
[This message has been edited by No 'E' in Camaro (edited 08-29-2001).]