Dear All, My question goes as follows: If we want equally distributed N-angles in a plane, then the angle between any two lines will be 360/N. e.g 5-equal angles will be calculated to 72-degs each. Now if the same five lines (centred at one point) have to be equally spread in a sphere, then what should be the angle between any two lines? OR The angle between two lines of a tetrahedron is 109.47°. How is it calculated?