Leḥsab n umḍan n tfekkiwin n lsas
X - Tehri n lqaɛa
Y - Tiɣzi n lqaɛa
F - Talɣa n tḥuna n tmeẓẓuɣt i lsas. Asekkil neɣ d aɣezfan.
D - Taɣect n usfugel.
A - Width n yiwen n usfugel n tmeẓẓuɣt.
B - Lqedd n yiwen n usfugel n tmeẓẓuɣt.
E - Ratio n tmurt n tmeẓdiyin s umata ɣer tmurt n tlemmast n tmurt.
Tizemmar n wahil.
Leḥsab n umḍan n tmeẓdiyin i tmeẓdiyin n llsas.
Iferdisen n tmes d tiwwura yellan deg weḥric n llsas yellan nnig wakal ay yettwasbedden akken ad sfeḍḍen ddaw wakal.
Aya yettḥettim-d asemres n lgaz n radon d ussekcem n tmeẓdiyin (moules) ɣef tmeṣkiwt n lebni.
Iferdisen n tmes neɣ iferdisen n tmes llan deg yimukan yemxallafen n tlemmast n tmurt akken ad ḍemnen aḍu yelhan.
Yettwaɛreḍ ad d-naf iberdan n tmes s wazal-nsen akken ilaq seg uswir n lqaɛa.
Ilaq ad yili lqidar n tmeẓdiyin n tmeẓdiyin ma ulac 1/400 n lqidar n tmeẓdiyin n tlemmast.
I temnaḍin aydeg yella lqidar n radon, yessefk ad yili lqidar-nni ma ulac 1/100.