The Math Forum

Search All of the Math Forum:

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

Math Forum » Discussions » Math Topics » geometry.pre-college

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: Alternate Formula for Radius of a Circle
Replies: 3   Last Post: Jul 6, 2006 5:41 PM

Advanced Search

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

Posts: 23
Registered: 4/9/06
Alternate Formula for Radius of a Circle
Posted: Jul 6, 2006 2:51 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

I am doing some review of basic math. I ran accross an answer in a
Schwaum's book that I can't make sense of and I wasn't able to derive
the formula either. Here is the problem.

Find the standard equation of the circle with center at (1,3) and
tangent to the line

To find the radius, the book uses the following formula

I solved the problem in a different way and got the right answer but I
couldn't figure out how the above equation was created and why it

Any insight you could give would be appreciated.

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

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.