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osculating circle

n.
1.the circle that touches a curve (on the concave side) and whose radius is the radius of curvature

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    Idiom of the Day

    year in and year out
    every year
    Year in and year out the city had to spend money to fix the old stadium.



    1.
    Choose an idiom to replace the expression in the brackets:
    I (asked my girlfriend to marry me) three weeks ago.

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