TREILLIS

Sommets inférieurs,

p = Cj cos a B| = G| sin a

Ei = C,

B, — B4 — 2C,8Îna=0

B, — B, — 2C,8ina = 0

Efc i = Cfc

Bk— Bk-j— îCkSina

«•jL 4. 4 (Ei = C»+i

|Bfc+,-B*-2C»+,sina = 0

Sommets supérieurs,

Ve 4 f El = Cj

(A, — 2CiSin« = 0

Al — A, + 2C,8ina = 0

A, — A, + 2C,8În« = 0

"'{"-^H B^.-B»^-2C«. 8iD«=0

»«— 1 *»fl— t

N'Cn)

p' + E«-i cos a = 0 B«, + En., sina = 0

(Ci — E»)C08a — P=0

A».i-Afc+iC*+Efc)8Îna=|

E*+i = Cfc+i

Ai— A»+, + 2CH^8ina=0

l An-t