explain exterior angle property Share with your friends Share 0 Pooja answered this Here is the link for the answer to your query:https://www.meritnation.com/ask-answer/question/when-do-we-use-angle-sum-property-and-exterior-angle-propert/the-triangle-and-its-properties/3009785 1 View Full Answer Doraemon answered this The angle formed by a side with its extended adjacent side of a triangle is called an exterior angle of the triangle. 0 Aditya Nandy answered this The angle formed by a side with its extended adjacent side of a triangle is called an exterior angle of the triangle.Exterior angle property states thatthe measure of exterior angles of a triangle is equal to the sum of its two interior opposite angles. 1