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exterior angle


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exterior angle - the angle between a side of a rectilinear figure and an adjacent side extended outward.
The sum of the measures of two exterior angles of a triangle is 205. What is the measure of the thir
The sum of the measures of two exterior angles of a triangle is 205. What is the measure of the third exterior angle? The sum of exterior angles for a triangle is 360. To find the third exterior angle, we take 360 - 205 = [B]155[/B].