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(none)
Posted:
Mar 12, 1994 8:43 AM


As a writer reentering the world of secondaryschool geometry after too long an absence, I seek guidance:
1) What is the current standard notation for   the line through points A and B ?  the ray from A through B ?  the line segment connecting A and B ?  the length of the segment connecting A and B?
2) How is "angle" defined? Here are some contemporary, conflicting examples taken from relatively recent secondary geometry texts:
Clemens & Clemens: An angle is made up of two rays with a common endpoint.
Lang & Murrow: Two rays starting from the same endpoint separate the plane into two regions. Each one of these regions will be called an angle determined by the rays.
Serra: An angle is two rays that share a common endpoint, provided that the two rays do not lie on the same line.
Thanks for any light you can shed on these questions.
(Note: If you're seeing this query for the second time, I apologize. I thought I had sent it before, but it didn't show up in my email as a message from the Forum, so I'm trying again.)
Bill Berlinghoff



