Question 906015
{{{drawing(400,300,-5,7,-5,4,

line(-4,0,6,0),line(-2,-4,0,0),line(0,0,0,3),
locate(-4,0,C),locate(0,0,B), locate(6,0,A),locate(0,3.5,E), locate(-2,-4,D),
rectangle(-.3,0,0,.3)

)}}}

linear pair (two adjacent angles forming a straight angle.)