# Precalculus

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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 -

You got the hardest part,

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

• Precalculus -

Right, I was using the radius as 100, but got it now. Thanks!!

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