Find Intersection of two tangent of arc

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I have one arc with given data :

  1. centre point
  2. arc start point angle
  3. arc end point angle
  4. arc start point radius
  5. arc end point radius (both radius are almost same)

now i want to find intersection point of two tangent of this arc. any help please?

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If $\alpha$ and $\beta$ are start and end point angles, then the intersection of the two tangents at the endpoints corresponds to an angle of $(\alpha+\beta)/2$ and to a distance from center $d=R/\cos(\beta-\alpha)$, where $R$ is the radius.