Shed so sanfɛla jatebɔ
A’ ye hakɛ wajibiyalenw fɔ milimɛtɛrɛ kɔnɔ
X - so bonya
Y - so sanfɛla janya
C - overhang hakɛ
B - so sanfɛla janya
tàyɔrɔ
Porogaramu in dabɔra ka jatebɔ kɛ bugu sanfɛla dɔ jɔli minɛnw kan: sɛbɛnfura hakɛ (ondulin, nulin, slate walima nɛgɛdaga), so sanfɛlanw dilanni minɛn (gilasinɛ, rubɛroyidi), batɛmu pankurunw ni jirisunw hakɛ.
Janto! Aw k’a to aw hakili la ko porogaramu bɛ sɛbɛnw jate ka kɛɲɛ ni so sanfɛla yɔrɔ ye.
Misali la, jirisun 2,9 bɛ sɛbɛn 7,6 caya jirisun kelen na. Jɔli lakika la, jirisun 3 bɛ bila.
Walasa ka jatebɔ nɔgɔya, a ka kan ka sɛbɛn in janya dɔgɔya fo ka se jateden dafalen hakɛ ma min bɛ se ka kɛ jirisunw ye.
Kɔfɛ, porogaramu wɛrɛ bɛna kɛ walasa ka so sanfɛlanw jateminɛ ni hakilitigiya ye.
Ani, kana ɲinɛ ka boon jɔli minɛnw san ni margin ye.