Tana (jeômetria)

Ny tana dia ny tsipika avy eo afovoan' ny faribolana mankany amin' ny hodidiny. Araka izany, ny tanan' ny bola dia ny tsipika avy eo amin' ny afovoan' ilay bola mankany amin' ny velarany.

Faribolana.

Ny fifandraisana ara-drefin' ny tanam-paribolana amin' ny hodidiny dia: $r={\frac {c}{2\pi }}$

Ny tsimiova $\pi$ dia 3,14159 eo ho eo.

Fikajiana ny tana

Mba hahafana mikajy ny tanan' ny faribolana manalo amina , dia azo ampiasaina manaraka :

r={\frac {|P_{1}-P_{3}|}{2\sin(\theta )}}

\theta \!

dia ny zoro

\angle P_{1}P_{2}P_{3}.

Jereo koa

Jeômetria

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