tangent lines

Curves' grazing contacts

Tangent lines touch a curve at exactly one point without crossing it there.

In geometry and calculus, the tangent line represents the instantaneous direction of a curve—its slope at that precise location.

The tangent line to a circle is perpendicular to the radius at the point of contact.

The concept extends to surfaces, where tangent planes serve the same function.

Related

calculus · touch · approximations · point · circle · graze · linearization · conic sections · rate of change · graphs · functions · mathematics · definition · rate · approach · gradient · asymptote · perpendicular

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Opposites
geometric intersection type

tangent linessecants

Curve-intersecting straight lines

intersecting lines · chords · transversals

contact vs non-contact

tangent linesparallel lines

Equidistant throughout their length

relationship to curves

tangent linesdiameters

Widths through centers

Family

line, entangle, entangled, tangent, tangential, untangled, entangling, entangles, tangency

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