Subtangenta

Subtangenta in sorodni pojmi so v geometriji odseki na premicah tako, da se pri tem uporablja tangenta na krivuljo v dani točki in koordinatne osi (lahko uporabimo kartezični koordinatni sistem ali polarni).
Definicija v kartezičnem koordinatnem sistemu
Naj bo kot naklona tangente proti x-osi. Ta kot je znan tudi kot tangentni kot. Torej velja
Subtangenta je potem
subnormala je potem
Normala je dana z
in tangenta je dana z
- .
Opomba:Glej sliko na desni.
Definicija v polarnem koordinatnem sistemu

Naj bo kot med tangento in smerjo OP. Ta kot je znan kot polarni tangentni kot. V tem primeru velja
- .
Polarna subtangenta je
Subnormala pa je
- .
Opomba:Glej sliko na desni.
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