What is the Area Of Intersection Of Two Circles
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With some basic trigonometry, we find the angles ∠ACB=∠AC′B=2π3. So, the area of one half of the intersection is the area of a circular segment with angle θ=2π3 and radius r, which gives an area of r22(θ−sinθ)=r22(2π3−√32) and so the area of the entire intersection is twice this.
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