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

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Posts: 23
Registered: 4/9/06
Alternate Formula for Radius of a Circle
Posted: Jul 6, 2006 2:51 AM
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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.

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