# How to find intersection points of 3 circles?

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Cladio Andrea il 17 Gen 2015
Risposto: Image Analyst il 17 Gen 2015
Hello, i have now a problem. I want to find the intersection points of these black area in the picture. i can find the intersection points of these three. But i want to have a code that calculate all the points of intersection points such as, 1 with 2, 2 with 3, 1 with 3 and 1,2,3, In the i wanna have something like:
• 1-2 intersection points minus 1,2,3 intersection points
• 1-3 intersection points minus 1,2,3 intersection points
• 1-2 intersection points minus 1,2,3 intersection points
• 1,2,3 intersection points
and then sum of these 4. Is there any easy way to do that. Thank you!
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Cladio Andrea il 17 Gen 2015
Modificato: Geoff Hayes il 17 Gen 2015
intersect(intersect(xq(in2),xq(in3)),xq(in4));
thats the code for intersection of these 3 circles

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### Risposte (1)

Image Analyst il 17 Gen 2015
It's just a pair of nested for loops - I'm sure you can figure it out.
for k = 1:3
for t = (k+1) : 3
% Determine intersections.
end
end
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