Exterior angle

Revision as of 17:38, 8 March 2014 by Greenpepper9999 (talk | contribs) (Created page with "<div style="float:right;"><asy>draw((0,50)--(40,1)--(0,0)--(0,50)); draw((0,50)--(0,68),linetype("0 2"),EndArrow); markscalefactor=0.4; draw(anglemark((40,1),(0,50),(0,68)),green...")
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[asy]draw((0,50)--(40,1)--(0,0)--(0,50)); draw((0,50)--(0,68),linetype("0 2"),EndArrow); markscalefactor=0.4; draw(anglemark((40,1),(0,50),(0,68)),green); label("A",(0,0),W); label("B",(40,0),NE); label("C",(0,50),W); label("D",(0,68),NW); [/asy]

An Exterior angle is the angle two lines form if one is extended as shown. In the figure, angle DCB is an exterior angle because its on the triangles exterior. it is supplementary to angle ACB.


  • All angles in a polygon sum to 360 degrees
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