English: Measures of separation between points on a circle: arc, angle, or intrinsic distance (red); chord or extrinsic distance (purple); versed sine (versine) or normal distance (green); half-tangent or stereographic distance (blue); and sine or orthographic distance (orange)
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Captions
Measures of separation between circle points: arc, angle, or intrinsic distance (red); chord or extrinsic distance (purple), versine or normal distance (green), half-tangent or stereographic distance (blue), and sine or orthographic distance (orange)