Tetiva (matematika)
Za druge pomene glej Tetiva (razločitev).
Tetiva v krogu Tetíva v geometriji je zveznica dveh točk krivulje , posebno pri krožnici . V obe smeri podaljšana tetiva je sečnica (presečnica, sekanta).
Dolžina tetive:
a
=
2
r
sin
α
2
{\displaystyle a=2r\sin {\frac {\alpha }{2}
α
{\displaystyle \alpha \,}
a
=
2
2
h
r
−
h
2
{\displaystyle a=2{\sqrt {2hr-h^{2}
h
{\displaystyle h}
Glej tudi
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