Nabani na owakhe wafunda ijiyometri kufuneka alifumene eli candelo, nangona umntu ezazi zonke iintlobo zejiyometri ngendlela efanayo, kufuneka kuthathelwe ingqalelo ukuba nabo baneempawu zabo kunye neeklasi. Makhe sijonge imeko ye oonxantathu, ngokokujikeleza kweengalo kunye namacala azo ziqulathe iimpawu ezizodwa. Into ekuchukumisayo malunga noku kukwazi ukunika uphononongo olufutshane kuzo zonke ezi klasi zikhoyo.
Ukuhamba ngokulula malunga nayo, kufanelekile ukuba uqale nge unxantathu olinganayo, yamkelwe ngokuba namacala ayo amathathu alinganayo nee-engile, kunokutshiwo ukuba ngunxantathu ogqibeleleyo ngobuhle.
Ukwahlula oku kungasentla, makhe sibone Isosceles unxantathu, equlethe kuphela amacala amabini alinganayo kwaye alandela lomgca mnye luhlobo lwesikali, apho amacala alo omathathu neeangile azilingani.
El unxantathu wesikali Lelinye linamacala alo onke anobude obahlukeneyo.
Ukucaciswa ngakumbi kwii-engile zayo, ibizwa ngegama unxantathu obukhali ngaphakathi kwayo malunga neekona ezintathu ezibi, kunye butho kumnini we-engile ye-obtuse. Oonxantathu be-butususe ngabo banenye yee-engile zabo zangaphakathi buthulu, oko kukuthi, inkulu kune-90. Ezinye ii-engile ezimbini zingaphantsi kwe-90 °.
Kwelinye icala, mhlawumbi oko kubizwa ngokuba unxantathu ofanelekileyo, ene-angle eyi-90 degrees, ukongeza kumacala ayo ifumana amagama athile: eyona inkulu ibizwa ngokuba yi-hypotenuse kwaye incinci ibizwa ngokuba yimilenze.