Angle of Intersection of Two Circles

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The angle of intersection of two overlapping circles is defined as the angle between their tangents at either of the intersection points. When the angle is 180°, we say that the circles are tangent. When the angle is 90°, we say that the circles are orthogonal. Drag the yellow or any of the colored points to change the circles.

Contributed by: Jaime Rangel-Mondragon (July 2014)
Open content licensed under CC BY-NC-SA




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