Supplementary angles that are not a linear pair

This is a field goal. These are found on sports fields. They are used by football players. These two angles are supplementary but they are not a linear pair. The two right angles in the corners are supplementary(they equal 180) but they are not a linear pair. http://www.google.com/imgres?um=1&hl=en&client=safari&tbo=d&rls=en&biw=1192&bih=639&tbm=isch&tbnid=qNSmk8Wt5v4sFM:&imgrefurl=http://thoughtupload.blogspot.com/2012/09/red-zone-field-goals-reacting-to-fixing.html&docid=IUsHW8GlzJgqLM&imgurl=https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGHzXwws5Qgc3Q_nVW-6kMxLBHVE4J-oNmKB4K4d1di1Ux031hQ-LbqLi9Jo6x5dYDWbpUFihrxjTZ0UrN6Mpsp_d8VtMTpB3BQGjdeC7_3A-u_G7jT5bwISoULSEH9pM_3YMpUX75ppVy/s1600/FieldGoal.jpg&w=1280&h=853&ei=SDOgUOv6KavE0AGLt4GwCw&zoom=1&iact=rc&dur=331&sig=101161591993119626923&page=1&tbnh=153&tbnw=230&start=0&ndsp=13&ved=1t:429,r:0,s:0,i:144&tx=87&ty=32