"103980780"@en-us . "105102889"^^ . "0"^^ . "05102889-n"^^ . . . . . . "osculating circle"@en-us . "104823484"@en-us . . . . "0"^^ . . "circle of curvature"@en-us . "circle of curvature"^^ . . "the circle that touches a curve (on the concave side) and whose radius is the radius of curvature"@en-us . .