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Angle of Intersection of Two Circles
For two circles of radii $$r_1,r_2$$ with centre distance $$d$$, if their angle of intersection is $$\theta$$:
$$\cos\theta=\frac{r_1^2+r_2^2-d^2}{2r_1r_2}$$
Usage
- Used to calculate the angle at which two intersecting circles meet.
