Posted by **jh** on Tuesday, March 9, 2010 at 8:20am.

A line segment has endpoints A=(1,3) and B=(13,19).

a) Find the equation of the circle for which the segment AB is a diameter.

Ans: (x - 7)^2 + (y - 11)^2 = 100

b) Accurate to the nearest tenth, the circumference of this circle is _______ ?

I was able to find a)the equation but I don't know how to find the circumference, PLEASE HELP!!

- Precalculus -
**Reiny**, Tuesday, March 9, 2010 at 8:26am
You got the hardest part,

from your equation isn't the radius equal to 10

And isn't the perimeter of a circle 2pi(r) ?

- Precalculus -
**jh**, Tuesday, March 9, 2010 at 8:29am
Right, I was using the radius as 100, but got it now. Thanks!!

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