[Graphs generated by this script: setBorder(60,30,60,30);initPicture(-10,10,-10,10); fontsize=14;fontstyle='none';marker=null;line([10,0],[3.0901699437495,9.5105651629515]);line([3.0901699437495,9.5105651629515],[-8.0901699437495,-5.8778525229247]);line([3.0901699437495,9.5105651629515],[3.0901699437495,-9.5105651629515]);line([-8.0901699437495,5.8778525229247],[-8.0901699437495,-5.8778525229247]);line([-8.0901699437495,5.8778525229247],[3.0901699437495,-9.5105651629515]);fontbackground='white';fontfill='blue';text([10,0],'A','belowright');dot([10,0]);fontfill='blue';text([3.0901699437495,9.5105651629515],'B','aboveright');dot([3.0901699437495,9.5105651629515]);fontfill='blue';text([-8.0901699437495,5.8778525229247],'C','aboveleft');dot([-8.0901699437495,5.8778525229247]);fontfill='blue';text([-8.0901699437495,-5.8778525229247],'D','belowleft');dot([-8.0901699437495,-5.8778525229247]);fontfill='blue';text([3.0901699437495,-9.5105651629515],'E','belowright');dot([3.0901699437495,-9.5105651629515]);]

What is the degree of vertex C