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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