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### Straight Angle vs. Line

Date: 09/07/97 at 11:58:49
From: Andrew
Subject: Geometry angle question

My question is simple. Why is a straight angle (line) not considered
an angle?

Thanks a lot.

Andrew

Date: 09/13/97 at 21:09:47
From: Doctor Mike
Subject: Re: Geometry angle question

Hi Andrew,

First of all, there is a difference between a line and a straight
angle. A line is a piece of geometry, whereas an angle is a measure of
how TWO lines come together.

I like to visualize a straight angle as 2 lines going out from the
same point, like ...

<----------------------*--------------------->

The point is the "*" and the lines go to the left and to the right.
The straight angle (180 degrees) is a measure of how those 2 lines
come together.  So, a line is not an angle, BUT a straight angle is a
fine angle.

I hope this helps.

-Doctor Mike,  The Math Forum
Check out our web site!  http://mathforum.org/dr.math/

Associated Topics:
Middle School Definitions
Middle School Geometry
Middle School Two-Dimensional Geometry

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