Kalkil bann raf.

Kalkil bann groser ek bann ang raft

Silvouple indik bann dimansion neseser an milimet

X - larzer lakaz
Y - oter twa
C - grander debordman
Z - distans depi bor tablo ziska koumansman koupe
B - Larzer raft

Referans

San bann brans, pa kapav konstrir enn twa.
Avek enn striktir twatir gable, li neseser kalkil dimansion bann rafters, bann ang koupe ek bann ranze.
Program kalkil rafter finn desine pou sa.
Baze lor larzer lakaz-la, oter depi koumansman ziska ranze twatir ek larzer debordman, longer bann brans ek distans ziska ranze-la kalkile.
Program-la pou osi desinn enn desin bann brans avek bann dimansion. Sa pou bien itil sirtou pou bann seki desid pou fer bann brans avek zot prop lame.