IEEE/ICACT20210142 Slide.11        [Big Slide]       Oral Presentation
The sector form-area with ¥è1 is r2cos-1(k). By subtracting the triangle ∆OAB area from sector-form area, we can obtain the area of half intersection S between C1 and C2. S: r2cos-1(k) – r^2 k¡î(1-k^2 ) ¡¦¡¦. (4)

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