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Waa maxay sababta wadooyinka diyaaradu u qaloocsan yihiin oo aanay u toosnayn?

Duulimaadyada diyaaradu ma raacaan xariiq toosan ee waxay raacaan dariiq qaloocan, doorkanina wuxuu ka baxsan yahay arin farsamo ah— waa la qabsiga curfiga meeraha laftiisa.
Joometry ahaan, waxaynu ka baranaynaa in masaafada ugu gaaban ee u dhaxaysa laba dhibcood ay tahay xariiq toosan, laakiin mabda’ani wuxuu khuseeyaa oo kaliya in la flat surfaces, sida waraaq oo kale. Marka la fiiriyo qaabka spherical ee dhulka, masaafada ugu gaaban ee u dhaxaysa laba qodob waxay noqotaa curfi loo yaqaano jeodesic.
Fikradani waxay asal ahaan ka timid joomatariga Riemannian, taas oo ku habboon in la qalqaloociyo.
Qorsheeyayaasha duulimaadka waxay isticmaalaan habkan si ay u khariideeyaan wadooyinka ugu gaaban si ay u badbaadiyaan waqtiga iyo shidaalka. Wadooyinkan jodesic waxay matalaan wadooyinka ugu wanaagsan ee meel kasta.
Halkii aad ku duuli lahayd “straight line” sida ka muuqata khariidad fidsan, diyaaraduhu waxay raacaan dabeecad daahsoon oo ah, saddex meelood xaqiiqada, dariiqa ugu gaaban.

Dariiqyadan hawada waxay tijaabo cajiib ah u yihiin curfiga dhulka. Duulimaad kastaa wuxuu raacaa koorso u muuqan karta in ay u muuqdaan mid la tirtiro, laakiin xaqiiqdii, waxay matalaysaa masaafada ugu gaaban iyo dadaalka ugu yar ee meeraheena spherical.

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