Uyilo lusekelwe kwijometri yee-angles ezifanelekileyo kunye nee-arcs.Ifom yanamhlanje, ehambelanayo iyamangalisa ngeenkcukacha ezicocwe ngokugqibeleleyo, kunye nomxube ofakwe eludongeni, kunye ne-spout yayo ekhombe kancane phambili, iphinda ivelise i-angle apho amanzi avela khona.