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BezierInfo-2/docs/images/snippets/circleintersection/2f42c862a0a9d0764727d42b16cf68a0.ascii
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r= dist(B(t), c)
┌─────────────────────────┐
│ 2 2
= │(B t - c ) + (B t - c )
⟍│ x x y y
┌─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│╭ 3 2 2 3 ╮2 ╭ 3 2 2 3 ╮2
= ││ x (1-t) + 3 x (1-t) t + 2 x (1-t) t + x t - c │ + │ y (1-t) + 3 y (1-t) t + 2 y (1-t) t + y t - c │
⟍│╰ 1 2 3 4 x ╯ ╰ 1 2 3 4 y ╯