Rays and Angles
Date: 11/24/97 at 01:11:49 From: Kerry Dennis Subject: Rays and Angles I do not understand rays. Do they have a arrow on both ends or is that an angle? Can you give me the defination of a ray?
Date: 11/24/97 at 09:07:38 From: Doctor Jerry Subject: Re: Rays and Angles Hi Kerry, Although there is no universally accepted definition of a ray, the most common definition is a line starting at some point of the plane or space and proceeding outwards. For example, the set of all real numbers larger than or equal to 5 is a ray. In the plane, the set of all points (x,x), where x >= 3 is a ray starting at (3,3) and going outwards "to infinity." Roughly speaking, a ray is "one-half" of a line. -Doctor Jerry, The Math Forum Check out our web site! http://mathforum.org/dr.math/
Search the Dr. Math Library:
Ask Dr. MathTM
© 1994- The Math Forum at NCTM. All rights reserved.