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the radian is the plane angle between two radii which, on the circumference of a circle, cut an arc equal in length to the radius, kesknurk, mille haarade vahele jääva ringjoonekaare pikkus on võrdne selle kaare raadiusega
tasanurga ühik . EKI terminibaas Esterm. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/tasanurga%20%C3%BChik/1/est (02.07.2026)
