Supplementary Angles that aren't a linear pair

This is a window or window sill and it forms to supplementary angles that aren't adjacent or aren't a linear pair. This picture is taken by me in Severn School, Ms.Sotoropolis's room. Windows are found in about every house in the world and are also found in office buildings, and other buildings usually. Windows are used for not to many things, they are used for a view outside, to air out the house, and to cool the house before or without air conditioning.