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(none)
Posted:
Mar 12, 1994 8:43 AM
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As a writer re-entering the world of secondary-school 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 e-mail as a
message from the Forum, so I'm trying again.)
Bill Berlinghoff
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