you might want the answer to this so that it could help you answer:Do you use addition or subtraction when you figure out an exterior angle?.
so here i go.
it is:the outside of a triangle, but is...
They equal the supplement of the interior angle it is adjacent to. (180-int. angle) E.g: the exterior angles of an equilateral triangle are each equal to 120 degrees.
When any side of triangle is extended outwards then exterior angle is formed. Sum of this exterior angle and adjacent interior angle = 180o.If exterior angle = 180o(straight angle) then interior...