Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Math Topics » alt.math.recreational.independent

Topic: Why can I draw a triangle with two 90 degree angles and one 0 degree angle?
Replies: 8   Last Post: Jul 26, 2010 2:28 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
McTernan, James

Posts: 1
Registered: 6/22/10
Re: Why can I draw a triangle with two 90 degree angles and one 0 degree angle?
Posted: Jun 22, 2010 2:59 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

You used the phrase "take the limit" very easily...

I thought the whole point of limits is that you may never be able to reach the value. Your triangle may become slimmer and slimmer, arbitrarily close to the ideal 90-90-0 triangle; but if you ever just set an angle to zero, your figure is "undefined", or at least controversial. You can only say that your angle can become smaller than any positive number.

This is the same thing that happens in the definition of the derivative. Delta can become arbitrarily close to zero, but setting it to zero makes the expression meaningless.



Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.