Re: Diameter and length?
- From: William Elliot <marsh@xxxxxxxxxxxxxxxxxx>
- Date: Tue, 19 Jul 2005 06:26:56 -0700
On Tue, 19 Jul 2005, 888 wrote:
> Someone in another newsgroup said that "diameter" and "length" are
> different and a row started because another said "diameter" is actually
> a "length".
>
The diameter is the distance of a line thru the center of a circle from
one point on the circumference of the circle to the other.
Length is the long side of a rectangle.
A right cylinder is measured by the diameter of it's base and
it's length. For example, a round tube may have a diameter of 2"
and a length of 2'.
> So mathematicians what do you make of this?
That if is this is cause for a ruckus, you should seek civil company.
> I think it depends how you define "length" - whether it means distance
> between two points in space or as a straight (outer) side of a shape.
>
Have you though of looking up the definitions in a dictionary?
The distance between two points isn't a length. It's a distance.
Line segments have lengths. The length of a straight line from
point A to point B equals the distance from point A to point B.
The length of a semi-circle from point A to point B =
(pi * distance from A to B)/2
Length applies to the long dimension of a geometric figure,
distance to space between points, diameter to the thickness of a round
object.
.
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