The curve tracked by a place on a tight, inextensible sequence since it unwinds from another bend.
A curve that cuts all tangents of another curve at correct perspectives; traced by a spot on a string that unwinds from a curved object.
A curve tracked by the end of a string injury upon another bend, or unwound from it; -- called in addition evolvent. See evolute.
what is included.
In geometry, the curve tracked by any point of a flexible and inextensible sequence whenever latter is unwrapped, under tension, from certain bend; or, this basically means, the locus of a place in the right line which rolls, without sliding, over confirmed curve.