case 1In 2D coordinate system the sum of the angles of all quadrants=360 degree= 2pi radianin (x,y) planeCase 2In 3D coordinate system (x,y,z) I took 3 possible planesi.e.(x,y) (y,z) (x,z)each ...

His invention used triangulation, a type of surveying using angles that was common until the end of the 20th century when global navigation satellite systems were created. The repeating circle worked ...