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.

External Links

Angle (Wolfram MathWorld)
Angle Measure
Circle-Circle Intersection (Wolfram MathWorld)

Permanent Citation

Jaime Rangel-Mondragon
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​"Angle of Intersection of Two Circles"​
​http://demonstrations.wolfram.com/AngleOfIntersectionOfTwoCircles/​
​Wolfram Demonstrations Project​
​Published: July 18, 2014