SOLUTION: What is the equation of the circle with center at (-3, 0) and diameter 20?

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Question 729413: What is the equation of the circle with center at (-3, 0) and diameter 20?
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!
formula for circle is:
%28x-h%29%5E2+%2B+%28y-k%29%5E2+=+r%5E2 where h and k are coordinates of the center, and r is the radius
you are given: center at (-3, 0) and diameter d=20
(-3, 0)=(h, k); so, h=-3 and k=0
d=20 and we know that r=d%2F2..=>..r=10
now, when you have h=-3, k=0, and r=10, plug it in formula
%28x-h%29%5E2+%2B+%28y-k%29%5E2+=+r%5E2
%28x-%28-3%29%29%5E2+%2B+%28y-0%29%5E2+=+10%5E2
%28x%2B3%29%5E2+%2B+y%5E2+=+100