When two lines meet at a vertex they form an included angle. Add 360 to both sides. Relationship Between Angles And Sides

OCTAHEDRAL – Bond angle 90. The octahedral geometry right occurs when there are 6 bonds and 0 lone pairs. Valence Shell Electron

A b tanα b a tanβ Given area and one leg. A comprehensive calculator for triangles to solve angles and sides in

The bond angle in a molecule of ammonia NH3 is 107 degrees so why when part of a transition metal complex is