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Geometry for School and Home
Activity 3.8
Assignment 3.9
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Assignment 4.16
Exterior Angles of Triangles
Objectives
Name exterior angles and their remote angles in triangles.
Develop and apply a theorem for the sum of the measures of exterior angles of triangles.
About Geometry Worksheet Assignment 4.16:
Assignment 4.16 is an introduction to exterior angles of triangles and the theorem about their measures.
Prerequisite Skills: Calculate the measures of angles in linear pairs (Assignment 4.4). Calculate the measures of angles in triangles (Assignment 4.8). Solve algebraic equations with one variable. Evaluate algebraic expressions.
Definition: The remote angles for an exterior angle of a triangle are the two angles of the triangle that do not have the same vertex as the
exterior angle.
Theorem: The measure of an exterior angle of a triangle is equal to the sum of the measures of the remote angles.