flat pattern + conecalc

 https://apkpure.com/flat-pattern-bend-calculator/ru.sotnikov.flatpattern

https://www.i-logic.com/conecalc/

Tecnofer srl - spirals - auger and screw conveyor flights

Tecnofer srl

https://www.tecnofergroup.com/metal-spirals/spirals-from-flat-steel.html

PRAZI PARTS Srl - spirals - auger and screw conveyor flights

PRAZI PARTS Srl

https://www.prazi-parts.it/en/p/8/spirals-augers.html

Mille S.R.L. - spirals - auger and screw conveyor flights

Mille S.R.L.

 https://www.millesrl.it/en/spirals-form-plate-and-cold-pressed-spiral-segments/

Panozzo srl

www.panozzosrl.com

Worksheet - Kvadratna jednadžba

 https://www.liveworksheets.com/worksheets/hr/Matematika/Kvadratna_jednad%C5%BEba/Kvadratna_jednad%C5%BEba_mj1311551ov

Kvadratna jednadžba

Worksheet - Vieteove formule

 

 https://www.liveworksheets.com/worksheets/hr/Matematika/Kvadratna_jednad%C5%BEba/Vieteove_formule_hk30283vn

Vieteove formule