Complete the proof of the Triangle Interior Angle Sum Theorem. Complete the proof of the Triangle Interior Angle Sum Theorem.АD431CВSuppose that line AD is parallel to line CB. Notice that Z124 -because they areAlso notice thatv because they areNow noticethat m24 + mZ3 + m25 =°. Finally using substitution we getm/1 + m22 + m23 =Q.E.D.

Answered: A D 4, 3 1 2 В ppose that line AD is…

Elementary Geometry for College Students

6th Edition

ISBN:9781285195698

Author:Daniel C. Alexander, Geralyn M. Koeberlein

Publisher:Daniel C. Alexander, Geralyn M. Koeberlein

Chapter10: Analytic Geometry

Section10.4: Analytic Proofs

Problem 30E: Complete an analytic proof of the following theorem: In a triangle that has sides of lengths a,b,...

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Complete the proof of the Triangle Interior Angle Sum Theorem.

Polygon with three sides, three angles, and three vertices. Based on the properties of each side, the types of triangles are scalene (triangle with three three different lengths and three different angles), isosceles (angle with two equal sides and two equal angles), and equilateral (three equal sides and three angles of 60°). The types of angles are acute (less than 90°); obtuse (greater than 90°); and right (90°).

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